Richard Frederick Kay
Professor of Evolutionary Anthropology
I have two areas of research:1) the evolution of primates in South America; and 2) the use of primate anatomy to reconstruct the phylogenetic history and adapations of living and extinct primates, especially Anthropoidea.
1) Evolution of primates and mammalian faunal evolution, especially in South America. For the past 30 years, I have been engaged in research in Argentina, Bolivia The Dominican Republic, Peru, and Colombia with three objectives:a) to reconstruct the evolutionary history and adaptive patterns of South America primates and other mammals; b) to establish a more precise geologic chronology for the mammalian faunas between the late Eocene and middle Miocene (between about 36 and about 15 million years ago); and c) to use anatomy and niche structure of modern mammals as a means to reconstruct the evolution of mammalian niche structure in the Neotropics.
2) Primate Anatomy. I am working to reconstruct the phylogeny of primates based (principally) on anatomical evidence; and to infer the adaptations of extinct primates based mainly on cranial and dental evidence.
Field activities
Current fieldwork is focused on the study of terrestrial biotic change in Patagonia through the 'mid-Miocene Climate Optimum' when global climate was moderate and the subtropical zone, with primates and other typically tropical vertebrates, extended their ranges up to 55 degrees of South latitude.
In this collaborative research undertaking with colleagues at University of Washington and Boise State University, the geochronology of the Santa Cruz Formation at in extreme southern Argentina is being refined using radiometric dating. Stratigraphically-controlled collections have been made of vertebrates and plant macro- and microfossils. Climate change and its impact on the biota is assessed 1) using biogeochemical analysis of stable isotopes in fossil mammalian tooth enamel; 2) by documenting changes in mammalian community structure (richness, origination and extinction rates, and ecological morphology); and 3) by documenting changes in vegetation and floral composition through the study of phytoliths. These three independent lines of evidence in a refined geochronologic framework will then be compared with similar evidence from continental sequences in the Northern Hemisphere and oceanic climatic records to improve our understanding of the timing and character of climatic change in continental high latitudes during this temporal interval.
A second field project project in its early stages is the study of the fossil vertebrates of the Amazon Basin. The latter is a collaborative effort of biologists and geologists across schools at Duke (Nicholas School) and among six North American universities. My role is to direct the vertebrate paleontology component of this project in Brazil and Amazonian Peru. The hope is to recover primates from the Oligocene through Early Miocene. New material will shed light on the phylogenetic status of African Paleogene anthropoids, one of which may be the platyrrhine sister-taxon. Also, new remains of fossil primates will help to refine hypotheses about the origins of the modern families and subfamilies of platyrrhines, all of which trace back to an Early Miocene (17-21 Ma) common ancestor. Finally, new fossil primates may further constrain the time of entry of platyrrhines into South America.
Current Appointments & Affiliations
- Professor of Evolutionary Anthropology, Evolutionary Anthropology, Trinity College of Arts & Sciences 2004
- Professor in the Division of Earth and Ocean Sciences, Earth and Climate Sciences, Nicholas School of the Environment 2011
Contact Information
- 0013 Biological Sciences Building, 130 Science Drive, Durham, NC 27708
- Duke Box 90383, Durham, NC 27708-0383
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richard.kay@duke.edu
(919) 684-2143
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http://evolutionaryanthropology.duke.edu/kay-lab
- Background
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Education, Training, & Certifications
- Ph.D., Yale University 1973
- M.Phil., Yale University 1971
- B.S., University of Michigan, Ann Arbor 1969
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Previous Appointments & Affiliations
- Director of Graduate Studies in Evolutionary Anthropology, Evolutionary Anthropology, Trinity College of Arts & Sciences 2012 - 2015
- Professor of Earth and Ocean Sciences in the Nicholas School of the Environment, Nicholas School of the Environment, Duke University 1997 - 2005
- Professor with Tenure, Basic Science Departments, School of Medicine 1988 - 2004
- Chair, Department of Biological Anthropology and Anatomy, Basic Science Departments, School of Medicine 1989 - 2004
- Professor, Geology, Trinity College of Arts & Sciences 1994 - 1997
- Professor, Geology, Trinity College of Arts & Sciences 1990 - 1994
- Acting Chairman, Basic Science Departments, School of Medicine 1988 - 1989
- Adjunct Associate Professor, Cultural Anthropology, Trinity College of Arts & Sciences 1978 - 1988
- Professor with Tenure, Basic Science Departments, School of Medicine 1984 - 1988
- Associate Professor with Tenure, Basic Science Departments, School of Medicine 1978 - 1983
- Assistant Professor, Basic Science Departments, School of Medicine 1973 - 1978
- Adjunct Assistant Professor, Cultural Anthropology, Trinity College of Arts & Sciences 1978
- Associate, Basic Science Departments, School of Medicine 1973
- Recognition
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In the News
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JUL 25, 2019 -
APR 24, 2018 -
SEP 2, 2014 -
SEP 2, 2014 Duke Today -
FEB 25, 2014 The News & Observer -
JAN 7, 2014 Nature World News -
JAN 7, 2014 Nature World News -
JAN 3, 2014 -
JAN 3, 2014 Duke Today
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Awards & Honors
- A symposium honoring Richard Kay- New views on primate adaptation and Evolution. AmericanAssociation of Physical Anthropologists. April 2018
- Dr. Luis Federico Leloir Prize for International Cooperation in Science, Technology and Innovation. Argentina Ministry of Science, Technology and Productive Innovation. November 17, 2014
- AAAS Fellows. American Association for the Advancement of Science, The. 2007
- Fellow, American Academy for the Advancement of Science. AAAS. 2007
- Paleontological Recognition Award. Museo Nacional de Historia Natural, Bolivia. May 1999
- Expertise
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Subject Headings
- Adaptation, Biological
- Anthropology, Physical
- Argentina
- Behavior, Animal
- Biological Evolution
- Caribbean Region
- Central America
- Colombia
- Dentition
- Diet
- Ecology
- Feeding Behavior
- Fossils
- Geography
- Geologic Sediments
- Geology
- Haplorhini
- Locomotion
- Mammals
- Muser Mentor
- Paleontology
- Phylogeny
- Platyrrhini
- Primates
- Semicircular Canals
- South America
- Visual Acuity
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Global Scholarship
- Research
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Selected Grants
- CSBR: Rescuing and Sharing a Unique and Irreplaceable Fossil Collection at the Duke Lemur Center awarded by National Science Foundation 2021 - 2024
- Hominin Dental Topography in 4D: A Novel Assessment of Diet awarded by L.S.B. Leakey Foundation 2021 - 2024
- Collaborative Research: Dental dynamics and catarrhine radiations awarded by National Science Foundation 2020 - 2023
- Recovering Paleogene and early Neogene Primates from Tropical South America awarded by L.S.B. Leakey Foundation 2019 - 2022
- FESD Type I: Dynamics of Mountains, Landscapes and Climate Biodiversity Amazon/Andean Forest awarded by National Science Foundation 2013 - 2020
- Fossil Mammals and the Waning of the Mid-Miocene Climate Optimum in Patagonia awarded by National Geographic Society 2017 - 2019
- Recovering Paleogene Vertebrates from the Alto Río Madre de Dios, Peruvian Amazon awarded by National Geographic Society 2017 - 2019
- CSBR: Ownership Transfer: Miocene Colombian Vertebrates and Conservation of the Duke Lemur Center Fossil Collections awarded by National Science Foundation 2015 - 2018
- Collaborative Research: Calibrating Mid-Miocene Greenhouse Climate and Ecology in a Key High Southern Latitude Locale awarded by National Science Foundation 2014 - 2017
- Intraspecific Variation in Semicircular Canal Morphology in Platyrrhine Monkeys and its Implications Toward Locomotor Evolution in Anthropoids. awarded by L.S.B. Leakey Foundation 2013 - 2016
- Doctoral Dissertation Research: Brain Size and Shape in Early Anthropoids awarded by National Science Foundation 2012 - 2015
- RAPID: Recovery of Miocene Fossil Primates and Other Vertebrates from Threatened Localities along the Rio Santa Cruz, Argentina awarded by National Science Foundation 2013 - 2014
- Paleontological Recovery Miocene South American Fossil Monkeys And Other Mammals: Phylogeny, Adaptation And Community Structure awarded by National Science Foundation 2009 - 2013
- Collaborative Proposal: Excavation of Underwater Cavern Containing Primates and Archaeological Remains in Hispaniola awarded by National Science Foundation 2010 - 2012
- Doctoral Dissertation Improvement: Functional Analysis of Primate Semicircular Canal Morphology in Relation to Locomotor Head Accelerations awarded by National Science Foundation 2008 - 2010
- Doctoral Dissertation Improvement: The Role of Binocular Vision in Primate Evolution awarded by National Science Foundation 2005 - 2008
- Evaluating the contribution of Late Cretaceous Biogeography to Earliest Cenozoic Biodiversity awarded by National Science Foundation 2002 - 2007
- Paleontological Investigations to Recover Fossil Monkeys From the Middle Cenozoic of South America awarded by National Science Foundation 2001 - 2006
- The First Near-Complete Skull of a Late Cretaceous Multituberculate from North America: ... awarded by National Science Foundation 2001 - 2005
- Collaborative Research: The Impact of Late Eocene/Early Oligocene Climate Change awarded by National Science Foundation 2001 - 2004
- An environmental scanning electron microscope for DU awarded by National Science Foundation 2001 - 2003
- Collaborative Research: Paleonotological Investigations To awarded by National Science Foundation 1994 - 2001
- Paleontologic Recovery and Reconnaisance at Grant Barranca, Argentina awarded by National Science Foundation 1999 - 2000
- Exploring For Paleogene Primates In Bolivia awarded by National Science Foundation 1992 - 1993
- Paleontology And Geochronology Of The Middle Micene Of Sou awarded by National Science Foundation 1992 - 1993
- Paleontology And Geochronology Of The Middle Miocene Of So awarded by National Science Foundation 1991 - 1993
- Paleontology And Geochronology Of The Middle Miocene Of awarded by National Science Foundation 1990 - 1992
- Dental Sexual Di-Morphism In The Catarrhine Primates awarded by National Science Foundation 1989 - 1991
- Biochronology And Geochronology Of Friasian (Middle Miocen awarded by National Science Foundation 1989 - 1990
- Collaborative Research: Biochronology And Geochronology Of awarded by National Science Foundation 1987 - 1989
- Collaborative Research On Sexual Dimorphism In The Definit awarded by National Science Foundation 1986
- Collaborative Research On Sexual Dimorphism In The Dentit awarded by National Science Foundation 1984 - 1986
- Publications & Artistic Works
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Selected Publications
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Books
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Madden, R. H., G. Vucetich, A. A. Carlini, and R. F. Kay. The Paleontology of Gran Barranca: Evolution and Environmental Change through the Middle Cenozoic of Patagonia. Cambridge, UK: University of Cambridge Press, 2010.
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Ross, C. F., and R. F. Kay. Anthropoid Origins: New Visions. New York: Kluwer/Plenum Publishers, 2004.
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Ross, Callum, and Richard F. Kay. Anthropoid Origins. Springer Science & Business Media, 2004.
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Plavcan, J. M., R. F. Kay, W. L. Jungers, and C. van Schaik. Reconstructing Behavior in the Primate Fossil Record. New York: Kluwer/Plenum Publishers, 2001.
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Kay, R. F., R. H. Madden, R. L. Ciffeli, and J. J. Flynn. Vertebrate Paleontology in the Neotropics. Washington, D. C.: Smithsonian Institution Press, 1997.
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Fleagle, J. G., and R. F. Kay. Anthropoid Origins: The Fossil Evidence. New York: Plenum Press, 1994.
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Academic Articles
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Pampush, J. D., P. E. Morse, E. J. Fuselier, M. M. Skinner, and R. F. Kay. “Sign-oriented Dirichlet Normal Energy: Aligning Dental Topography and Dental Function in the R-package molaR.” Journal of Mammalian Evolution 29, no. 4 (December 1, 2022): 713–32. https://doi.org/10.1007/s10914-022-09616-6.Full Text Open Access Copy
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Vizcaíno, S. F., M. S. Bargo, M. E. Pérez, I. Aramendía, J. I. Cuitiño, E. S. Monsalvo, E. Vlachos, J. I. Noriega, and R. F. Kay. “Fossil vertebrates of the early-middle Miocene Cerro Boleadoras Formation, northwestern Santa Cruz Province, Patagonia, Argentina.” Andean Geology 49, no. 3 (September 1, 2022): 382–422. https://doi.org/10.5027/andgeoV49n3-3425.Full Text Open Access Copy
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Lundeen, Ingrid K., and Richard F. Kay. “Unique nasal turbinal morphology reveals Homunculus patagonicus functionally converged on modern platyrrhine olfactory sensitivity.” Journal of Human Evolution 167 (June 2022): 103184. https://doi.org/10.1016/j.jhevol.2022.103184.Full Text Open Access Copy
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Fleagle, J. G., J. T. Gladman, and R. F. Kay. “A New Humerus of Homunculus patagonicus, a Stem Platyrrhine from the Santa Cruz Formation (Late Early Miocene), Santa Cruz Province, Argentina.” Ameghiniana 59, no. 1 (January 1, 2022): 78–96. https://doi.org/10.5710/AMGH.29.09.2021.3447.Full Text Open Access Copy
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Palazzesi, L., S. F. Vizcaíno, V. D. Barreda, J. I. Cuitiño, C. J. del Río, F. Goin, M. S. González Estebenet, et al. “Reconstructing Cenozoic Patagonian biotas using multi-proxy fossil records.” Journal of South American Earth Sciences 112 (December 1, 2021). https://doi.org/10.1016/j.jsames.2021.103513.Full Text Open Access Copy
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Kay, R. F., S. F. Vizcaíno, M. S. Bargo, J. P. Spradley, and J. I. Cuitiño. “Paleoenvironments and paleoecology of the Santa Cruz Formation (early-middle Miocene) along the Río Santa Cruz, Patagonia (Argentina).” Journal of South American Earth Sciences 109 (August 1, 2021). https://doi.org/10.1016/j.jsames.2021.103296.Full Text Open Access Copy
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Kay, R. F. “Leonard B. Radinsky (1937–1985), Radical Biologist.” Journal of Mammalian Evolution 28, no. 1 (March 1, 2021): 7–14. https://doi.org/10.1007/s10914-019-09479-4.Full Text Open Access Copy
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Cuitiño, J. I., M. S. Raigemborn, M. S. Bargo, S. F. Vizcaíno, N. A. Muñoz, M. J. Kohn, and R. F. Kay. “Insights on the controls on floodplain-dominated fluvial successions: A perspective from the early–middle miocene santa cruz formation in río chalía (patagonia, argentina).” Journal of the Geological Society 178, no. 4 (January 1, 2021). https://doi.org/10.1144/jgs2020-188.Full Text Open Access Copy
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Vizcaíno, S. F., M. S. Bargo, R. F. Kay, and M. S. Raigemborn. “The record of the typothere Pachyrukhos (Mammalia, Notoungulata) and the Chinchillid Prolagostomus (Mammalia, Rodentia) in the Santa Cruz Formation (early-middle Miocene) south to the Río Coyle, Patagonia, Argentina.” Publicacion Electronica De La Asociacion Paleontologica Argentina 21, no. 2 (January 1, 2021): 1–15. https://doi.org/10.5710/PEAPA.26.05.2021.385.Full Text Open Access Copy
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Rodríguez-Gómez, G., G. H. Cassini, P. Palmqvist, M. S. Bargo, N. Toledo, J. A. Martín-González, N. A. Muñoz, R. F. Kay, and S. F. Vizcaíno. “Testing the hypothesis of an impoverished predator guild in the Early Miocene ecosystems of Patagonia: An analysis of meat availability and competition intensity among carnivores.” Palaeogeography, Palaeoclimatology, Palaeoecology 554 (September 15, 2020). https://doi.org/10.1016/j.palaeo.2020.109805.Full Text Open Access Copy
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Trayler, R. B., M. J. Kohn, M. S. Bargo, J. I. Cuitiño, R. F. Kay, C. A. E. Strömberg, and S. F. Vizcaíno. “Patagonian Aridification at the Onset of the Mid-Miocene Climatic Optimum.” Paleoceanography and Paleoclimatology 35, no. 9 (September 1, 2020). https://doi.org/10.1029/2020PA003956.Full Text Open Access Copy
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Li, Peishu, Paul E. Morse, and Richard F. Kay. “Dental topographic change with macrowear and dietary inference in Homunculus patagonicus.” Journal of Human Evolution 144 (July 2020): 102786. https://doi.org/10.1016/j.jhevol.2020.102786.Full Text Open Access Copy
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Valenta, K., D. J. Daegling, O. Nevo, J. Ledogar, D. Sarkar, U. Kalbitzer, S. Bortolamiol, et al. “Fruit Selectivity in Anthropoid Primates: Size Matters.” International Journal of Primatology 41, no. 3 (June 1, 2020): 525–37. https://doi.org/10.1007/s10764-020-00158-3.Full Text Open Access Copy
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Trayler, R. B., M. D. Schmitz, J. I. Cuitiño, M. J. Kohn, M. S. Bargo, R. F. Kay, C. A. E. Strömberg, and S. F. Vizcaíno. “An improved approach to age-modeling in deep time: Implications for the Santa Cruz Formation, Argentina.” Bulletin of the Geological Society of America 132, no. 1–2 (January 1, 2020): 233–44. https://doi.org/10.1130/B35203.1.Full Text Open Access Copy
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Plavcan, J Michael, Carol V. Ward, Richard F. Kay, and Fredrick K. Manthi. “A diminutive Pliocene guenon from Kanapoi, West Turkana, Kenya.” Journal of Human Evolution 135 (October 2019): 102623. https://doi.org/10.1016/j.jhevol.2019.05.011.Full Text Open Access Copy
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Kay, Richard F., Lauren A. Gonzales, Wout Salenbien, Jean-Noël Martinez, Siobhán B. Cooke, Luis Angel Valdivia, Catherine Rigsby, and Paul A. Baker. “Parvimico materdei gen. et sp. nov.: A new platyrrhine from the Early Miocene of the Amazon Basin, Peru.” Journal of Human Evolution 134 (September 2019): 102628. https://doi.org/10.1016/j.jhevol.2019.05.016.Full Text Open Access Copy
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Pampush, James D., Jordan Crowell, Aleksis Karme, Scott A. Macrae, Richard F. Kay, and Peter S. Ungar. “Technical note: Comparing dental topography software using platyrrhine molars.” American Journal of Physical Anthropology 169, no. 1 (May 2019): 179–85. https://doi.org/10.1002/ajpa.23797.Full Text
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Spradley, J. P., B. J. Glazer, and R. F. Kay. “Mammalian faunas, ecological indices, and machine-learning regression for the purpose of paleoenvironment reconstruction in the Miocene of South America.” Palaeogeography, Palaeoclimatology, Palaeoecology 518 (March 15, 2019): 155–71. https://doi.org/10.1016/j.palaeo.2019.01.014.Full Text Open Access Copy
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Bhandari, Ansuya, Richard F. Kay, Blythe A. Williams, Brahma Nand Tiwari, Sunil Bajpai, and Tobin Hieronymus. “Correction: First record of the Miocene hominoid Sivapithecus from Kutch, Gujarat state, western India.” Plos One 14, no. 5 (January 2019): e0217960. https://doi.org/10.1371/journal.pone.0217960.Full Text
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Fernicola, J. C., M. S. Bargo, S. F. Vizcaíno, and R. F. Kay. “Historical background for a revision of the paleontology of the Santa Cruz formation (Early–Middle Miocene) along the rÍo Santa Cruz, Patagonia, Argentina.” Publicacion Electronica De La Asociacion Paleontologica Argentina 19, no. 2 (January 1, 2019). https://doi.org/10.5710/PEAPA.18.09.2019.300.Full Text Open Access Copy
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Fernicola, J. C., S. F. Vizcaíno, M. Susana Bargo, R. F. Kay, and J. I. Cuitiño. “Analysis of the Early-Middle Miocene mammal associations at the Río Santa Cruz (Patagonia, Argentina).” Publicacion Electronica De La Asociacion Paleontologica Argentina 19, no. 2 (January 1, 2019): 239–59. https://doi.org/10.5710/PEAPA.01.11.2019.309.Full Text Open Access Copy
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Gonzales, Lauren A., Michael D. Malinzak, and Richard F. Kay. “Intraspecific variation in semicircular canal morphology-A missing element in adaptive scenarios?” American Journal of Physical Anthropology 168, no. 1 (January 2019): 10–24. https://doi.org/10.1002/ajpa.23692.Full Text Open Access Copy
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Kay, R. F., and J. M. G. Perry. “New primates from the Río Santa Cruz and Río Bote (Early-Middle Miocene), Santa Cruz Province, Argentina.” Publicacion Electronica De La Asociacion Paleontologica Argentina 19, no. 2 (January 1, 2019): 230–38. https://doi.org/10.5710/PEAPA.24.08.2019.289.Full Text Open Access Copy
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Pampush, J. D., J. P. Spradley, P. E. Morse, D. Griffith, J. T. Gladman, L. A. Gonzales, and R. F. Kay. “Adaptive wear-based changes in dental topography associated with atelid (Mammalia: Primates) diets.” Biological Journal of the Linnean Society 124, no. 4 (August 1, 2018): 584–606. https://doi.org/10.1093/biolinnean/bly069.Full Text Open Access Copy
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Kay, Richard F. “100 years of primate paleontology.” American Journal of Physical Anthropology 165, no. 4 (April 2018): 652–76. https://doi.org/10.1002/ajpa.23429.Full Text Open Access Copy
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Bhandari, Ansuya, Richard F. Kay, Blythe A. Williams, Brahma Nand Tiwari, Sunil Bajpai, and Tobin Hieronymus. “First record of the Miocene hominoid Sivapithecus from Kutch, Gujarat state, western India.” Plos One 13, no. 11 (January 2018): e0206314. https://doi.org/10.1371/journal.pone.0206314.Full Text Open Access Copy
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Spradley, Jackson P., James D. Pampush, Paul E. Morse, and Richard F. Kay. “Smooth operator: The effects of different 3D mesh retriangulation protocols on the computation of Dirichlet normal energy.” American Journal of Physical Anthropology 163, no. 1 (May 2017): 94–109. https://doi.org/10.1002/ajpa.23188.Full Text Open Access Copy
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Vizcaíno, Sergio, Gerardo De Iullis, Paul Brinkman, Richard Kay, and Daniel Brinkman. “ON AN ALBUM OF PHOTOGRAPHS RECORDING FOSSILS IN THE "OLD COLLECTIONS" OF THE MUSEO DE LA PLATA AND AMEGHINO?S PRIVATE COLLECTION AT THE BEGINNING OF THE XXTH CENTURY.” Publicación Electrónica De La Asociación Paleontológica Argentina, 2017. https://doi.org/10.5710/peapa.21.06.2017.244.Full Text Open Access Copy
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Pampush, J. D., J. M. Winchester, P. E. Morse, A. Q. Vining, D. M. Boyer, and R. F. Kay. “Introducing molaR: a New R Package for Quantitative Topographic Analysis of Teeth (and Other Topographic Surfaces).” Journal of Mammalian Evolution 23, no. 4 (December 1, 2016): 397–412. https://doi.org/10.1007/s10914-016-9326-0.Full Text Open Access Copy
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Pampush, James D., Jackson P. Spradley, Paul E. Morse, Arianna R. Harrington, Kari L. Allen, Doug M. Boyer, and Richard F. Kay. “Wear and its effects on dental topography measures in howling monkeys (Alouatta palliata).” American Journal of Physical Anthropology 161, no. 4 (December 2016): 705–21. https://doi.org/10.1002/ajpa.23077.Full Text Open Access Copy
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Fulwood, Ethan L., Doug M. Boyer, and Richard F. Kay. “Stem members of Platyrrhini are distinct from catarrhines in at least one derived cranial feature.” Journal of Human Evolution 100 (November 2016): 16–24. https://doi.org/10.1016/j.jhevol.2016.08.001.Full Text Open Access Copy
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Cuitiño, J. I., J. C. Fernicola, M. J. Kohn, R. Trayler, M. Naipauer, M. S. Bargo, R. F. Kay, and S. F. Vizcaíno. “U-Pb geochronology of the Santa Cruz Formation (early Miocene) at the Río Bote and Río Santa Cruz (southernmost Patagonia, Argentina): Implications for the correlation of fossil vertebrate localities.” Journal of South American Earth Sciences 70 (October 1, 2016): 198–210. https://doi.org/10.1016/j.jsames.2016.05.007.Full Text Open Access Copy
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Boyer, Doug M., E Christopher Kirk, Mary T. Silcox, Gregg F. Gunnell, Christopher C. Gilbert, Gabriel S. Yapuncich, Kari L. Allen, et al. “Internal carotid arterial canal size and scaling in Euarchonta: Re-assessing implications for arterial patency and phylogenetic relationships in early fossil primates.” J Hum Evol 97 (August 2016): 123–44. https://doi.org/10.1016/j.jhevol.2016.06.002.Full Text Open Access Copy Link to Item
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Spradley, Jackson P., Kenneth E. Glander, and Richard F. Kay. “Dust in the wind: How climate variables and volcanic dust affect rates of tooth wear in Central American howling monkeys.” American Journal of Physical Anthropology 159, no. 2 (February 2016): 210–22. https://doi.org/10.1002/ajpa.22877.Full Text Open Access Copy
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Raigemborn, M. S., S. D. Matheos, V. Krapovickas, S. F. Vizcaíno, M. S. Bargo, R. F. Kay, J. C. Fernicola, and L. Zapata. “Paleoenvironmental reconstruction of the coastal Monte Léon and Santa Cruz formations (Early Miocene) at Rincón del Buque, Southern Patagonia: A revisited locality.” Journal of South American Earth Sciences 60 (July 1, 2015): 31–55. https://doi.org/10.1016/j.jsames.2015.03.001.Full Text Open Access Copy
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Boyer, D. M., J. Winchester, and R. F. Kay. “Erratum: The effect of differences in methodology among some recent applications of shearing quotients (American Journal of Physical Anthropology (2015) 156 (166-178)).” American Journal of Physical Anthropology 157, no. 1 (May 1, 2015): 178. https://doi.org/10.1002/ajpa.22746.Full Text Open Access Copy
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Kay, Richard F. “Anthropology. New World monkey origins.” Science (New York, N.Y.) 347, no. 6226 (March 2015): 1068–69. https://doi.org/10.1126/science.aaa9217.Full Text Open Access Copy
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Allen, Kari L., Siobhán B. Cooke, Lauren A. Gonzales, and Richard F. Kay. “Dietary inference from upper and lower molar morphology in platyrrhine primates.” Plos One 10, no. 3 (January 2015): e0118732. https://doi.org/10.1371/journal.pone.0118732.Full Text Open Access Copy
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Boyer, Doug M., Julia Winchester, and Richard F. Kay. “The effect of differences in methodology among some recent applications of shearing quotients.” American Journal of Physical Anthropology 156, no. 1 (January 2015): 166–78. https://doi.org/10.1002/ajpa.22619.Full Text Open Access Copy
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Kay, Richard F. “Biogeography in deep time - What do phylogenetics, geology, and paleoclimate tell us about early platyrrhine evolution?” Mol Phylogenet Evol 82 Pt B (January 2015): 358–74. https://doi.org/10.1016/j.ympev.2013.12.002.Full Text Open Access Copy Link to Item
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Perry, Jonathan M. G., Richard F. Kay, Sergio F. Vizcaíno, and M Susana Bargo. “Oldest known cranium of a juvenile New World monkey (Early Miocene, Patagonia, Argentina): implications for the taxonomy and the molar eruption pattern of early platyrrhines.” Journal of Human Evolution 74 (September 2014): 67–81. https://doi.org/10.1016/j.jhevol.2014.03.009.Full Text Open Access Copy
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Forasiepi, A. M., M. R. Sánchez-Villagra, T. Schmelzle, S. Ladevèze, and R. F. Kay. “An exceptionally well-preserved skeleton of Palaeothentes from the Early Miocene of Patagonia, Argentina: new insights into the anatomy of extinct paucituberculatan marsupials.” Swiss Journal of Palaeontology 133, no. 1 (July 1, 2014). https://doi.org/10.1007/s13358-014-0063-9.Full Text Open Access Copy
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Fernicola, J. C., J. I. Cuitiño, S. F. Vizcaíno, M. S. Bargo, and R. F. Kay. “Fossil localities of the Santa Cruz Formation (Early Miocene, Patagonia, Argentina) prospected by Carlos Ameghino in 1887 revisited and the location of the Notohippidian.” Journal of South American Earth Sciences 52 (January 1, 2014): 94–107. https://doi.org/10.1016/j.jsames.2014.02.002.Full Text Open Access Copy
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Fernicola, J. C., J. I. Cuitiño, S. F. Vizcaíno, M. S. Bargo, and R. F. Kay. “Fossil Localities Of The Santa Cruz Formation (Lower Miocene, Patagonia, Argentina) Prospected By Carlos Ameghino In 1887. The Problem Of The Notohippidian Stage.” South American Journal of Earth Sciences 52 (2014): 94–107.Open Access Copy
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Patnaik, R., K. Milankumar Sharma, L. Mohan, B. A. Williams, R. F. Kay, and P. Chatrath. “Additional Vertebrate Remains from the Early Miocene of Kutch, Gujarat.” Special Publication of the Paleontological Society of India 5 (2014): 335–51.Open Access Copy
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Malinzak, Michael D., Richard F. Kay, and Timothy E. Hullar. “Locomotor head movements and semicircular canal morphology in primates.” Proc Natl Acad Sci U S A 109, no. 44 (October 30, 2012): 17914–19. https://doi.org/10.1073/pnas.1206139109.Full Text Open Access Copy Link to Item
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Kay, Richard F. “Evidence for an Asian origin of stem anthropoids.” Proceedings of the National Academy of Sciences of the United States of America 109, no. 26 (June 2012): 10132–33. https://doi.org/10.1073/pnas.1207933109.Full Text Open Access Copy
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Wilson, L. A. B., R. H. Madden, R. F. Kay, and M. R. Sánchez-Villagra. “Testing a developmental model in the fossil record: Molar proportions in South American ungulates.” Paleobiology 38, no. 2 (March 1, 2012): 308–21. https://doi.org/10.1666/11001.1.Full Text Open Access Copy
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Allen, Kari L., and Richard F. Kay. “Dietary quality and encephalization in platyrrhine primates.” Proceedings. Biological Sciences 279, no. 1729 (February 2012): 715–21. https://doi.org/10.1098/rspb.2011.1311.Full Text Open Access Copy
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Malinzak, G., M. D. Kay, R. F. Hullar, and T. E. “Predicting locomotion from the primate semicircular canal system.” Proceedings of the National Academy (Usa) 109 (2012): 17914–19.Open Access Copy
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Allen, Kari, Lauren Gonzales, Siobhan Cooke, and Richard Kay. “EVALUATION OF UPPER MOLAR OCCLUSAL MORPHOLOGY FOR DIETARY INFERENCE IN MID- TO LARGE-BODIED PLATYRRHINI (PRIMATES).” Journal of Vertebrate Paleontology 31 (January 1, 2011): 61–61.Link to Item
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Kay, R. F., K. D. Hunt, C. D. Beeker, G. W. Conrad, C. C. Johnson, and J. Keller. “Preliminary notes on a newly discovered skull of the extinct Hispaniolian monkey Antillothrix from Hispaniola and the origin of the Greater Antillean monkeys.” Journal of Human Evolution 60 (2011): 124–28. https://doi.org/10.1016/j.jhevol.2010.09.003.Full Text Open Access Copy
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Kay, R. F., K. L. Allen, L. A. Gonzales, K. L. Krueger, and K. D. Hunt. “Dietary reconstruction of Antillothrix bernensis, a Holocene monkey from the Dominican Republic.” Journal of Vertebrate Paleontology 31 (2011).
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Williams, Blythe A., Richard F. Kay, E Christopher Kirk, and Callum F. Ross. “Darwinius masillae is a strepsirrhine--a reply to Franzen et al. (2009).” Journal of Human Evolution 59, no. 5 (November 2010): 567–73. https://doi.org/10.1016/j.jhevol.2010.01.003.Full Text Open Access Copy
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Williams, Blythe A., Richard F. Kay, and E Christopher Kirk. “New perspectives on anthropoid origins.” Proceedings of the National Academy of Sciences of the United States of America 107, no. 11 (March 2010): 4797–4804. https://doi.org/10.1073/pnas.0908320107.Full Text
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Coleman, M., R. F. Kay, and M. W. Colbert. “Auditory Morphology and Hearing Sensitivity in Fossil New World Monkeys.” Anatomical Record 293 (2010): 1711–21. https://doi.org/10.1002/ar.21199.Full Text Open Access Copy
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Kay, R. F., and J. G. Fleagle. “Stem taxa, homoplasy, long lineages, and the phylogenetic position of Dolichocebus.” Journal of Human Evolution 59, no. 2 (January 1, 2010): 218–22. https://doi.org/10.1016/j.jhevol.2010.03.002.Full Text Open Access Copy
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Perry, J. M. G., R. F. Kay, S. F. Vizcaíno, and M. S. Bargo. “Tooth root size, chewing muscle leverage, and the biology of Homunculus patagonicus (Primates) from the late early Miocene of Patagonia.” Ameghiniana 47, no. 3 (January 1, 2010): 355–71. https://doi.org/10.5710/AMGH.v47i3.9.Full Text Open Access Copy
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Vizcaíno, S. F., M. S. Bargo, R. F. Kay, R. A. Fariña, M. Di Giacomo, J. M. G. Perry, F. J. Prevosti, N. Toledo, G. H. Cassini, and J. C. Fernicola. “A baseline paleoecological study for the Santa Cruz Formation (late-early Miocene) at the Atlantic Coast of Patagonia, Argentina.” Palaeogeography, Palaeoclimatology, Palaeoecology 292, no. 3–4 (January 1, 2010): 507–19. https://doi.org/10.1016/j.palaeo.2010.04.022.Full Text Open Access Copy
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Williams, B. A., R. F. Kay, E. C. Kirk, and C. Ross. “Darwinius masillae is a European middle Eocene stem strepsirrhine—a reply to Franzen et al.” Journal of Human Evolution 59 (2010): 567–73.
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Williams, B. A., R. F. Kay, E. C. Kirk, and C. Ross. “Darwinius masillae is a European middle Eocene stem strepsirrhine.” Journal of Human Evolution 59 (2010): 567–73.
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Bargo, M. S., S. F. Vizcaíno, and R. F. Kay. “Predominance of orthal masticatory movements in the early Miocene Eucholaeops (Mammalia, Xenarthra, Tardigrada, Megalonychidae) and other megatherioid sloths.” Journal of Vertebrate Paleontology 29, no. 3 (December 1, 2009): 870–80. https://doi.org/10.1671/039.029.0324.Full Text
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Kay, Richard F. “Much Hype and Many Errors The Link Uncovering Our Earliest Ancestor by Colin Tudge, with Josh Young Little, Brown, New York, 2009. 304 pp. $25.99, C$28.99. ISBN 9780316070089.” Science 325, no. 5944 (August 28, 2009): 1074–75. https://doi.org/10.1126/science.1177071.Full Text
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Malinzak, M. D., and R. F. Kay. “Systematic characterization of locomotor head movements in Lemur catta.” American Journal of Physical Anthropology, January 1, 2009, 182–182.Link to Item
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Krueger, Kristin L., Jessica R. Scott, Richard F. Kay, and Peter S. Ungar. “Technical note: Dental microwear textures of "Phase I" and "Phase II" facets.” American Journal of Physical Anthropology 137, no. 4 (December 2008): 485–90. https://doi.org/10.1002/ajpa.20928.Full Text
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Bajpai, Sunil, Richard F. Kay, Blythe A. Williams, Debasis P. Das, Vivesh V. Kapur, and B. N. Tiwari. “The oldest Asian record of Anthropoidea.” Proceedings of the National Academy of Sciences of the United States of America 105, no. 32 (August 2008): 11093–98. https://doi.org/10.1073/pnas.0804159105.Full Text
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Kay, R. F., S. F. Vizcaíno, M. S. Bargo, J. M. G. Perry, F. J. Prevosti, and J. C. Fernicola. “Two new fossil vertebrate localities in the Santa Cruz Formation (late early - early middle Miocene, Argentina), ∼51° South latitude.” Journal of South American Earth Sciences 25, no. 2 (March 1, 2008): 187–95. https://doi.org/10.1016/j.jsames.2007.07.003.Full Text
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Kay, Richard F., J. G. Fleagle, T. R. T. Mitchell, Matthew Colbert, Tom Bown, and Dennis W. Powers. “The anatomy of Dolichocebus gaimanensis, a stem platyrrhine monkey from Argentina.” Journal of Human Evolution 54, no. 3 (March 2008): 323–82. https://doi.org/10.1016/j.jhevol.2007.09.002.Full Text
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Goin, F. J., M. R. Sánchez-Villagra, A. Abello, and R. F. Kay. “A new generalized paucituberculatan marsupial from the oligocene of Bolivia and the origin of 'shrew-like' opossums.” Palaeontology 50, no. 5 (September 1, 2007): 1267–76. https://doi.org/10.1111/j.1475-4983.2007.00706.x.Full Text
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Goin, F., A. Abello, E. Bellosi, R. Kay, R. Madden, and A. Carlini. “South American metatherians from the begining of the neogene (Early Miocene, Colhuehuapan Land-mammal Age). Part 1: Introduction, didelphimorphia and sparassodonta.” Ameghiniana 44, no. 1 (March 30, 2007): 29–71.
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Bajpai, S., J. G. M. Thewissen, R. F. Kay, M. Colbert, and V. Kaspur. “An overview of terrestrial mammals from Cambay shale, Vastan lignite mine, Gujarat (western India), with new taxa and age constraints.” Journal of Vertebrate Paleontology 27, Suppl to Issue 3 (2007): 42A-43A.
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Coleman, M., and R. F. Kay. “Evaluaing hearing sensitivity in Homunculus patagonicus.” American Journal of Physical Anthropology 98 (2007): 89.
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Goin, F. J., A. Abello, E. Bellosi, R. F. Kay, R. H. Madden, and A. A. Carlini. “Los Metatheria sudamericanos de comienzos del Neógeno (Mioceno temprano, Edad-mamífero Colhuehuapense). Parte 1: Introducción, Didelphimorphia y Sparassodonta.” Ameghiniana 44 (2007): 29–71.
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Vizcaíno, S. F., M. S. Bargo, R. F. Kay, J. C. Fernicola, F. Prevosti, J. M. Toledo, J. G. M. Perry, R. H. Madden, and L. H. Pomi. “Vertebrados de los niveles inferiores de la Formación Santa Cruz (Mioceno inferior-medio, Argentina).” Ameghiniana Resumenes, XXIII Jornadas Argentinas de Paleontología Vertebrados, Trelew, Argentina, 21-23 de mayo. (2007): 35.
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Forasiepi, A. M., M. R. Sánchez-Villagra, F. J. Goin, M. Takai, N. Shigehara, and R. F. Kay. “A new species of Hathliacynidae (Metatheria, Sparassodonta) from the middle Miocene of Quebrada Honda, Bolivia.” Journal of Vertebrate Paleontology 26, no. 3 (September 11, 2006): 670–84. https://doi.org/10.1671/0272-4634(2006)26[670:ANSOHM]2.0.CO;2.Full Text
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Vizcaíno, S. F., M. S. Bargo, R. F. Kay, and N. Milne. “The armadillos (Mammalia, Xenarthra, Dasypodidae) of the Santa Cruz Formation (early-middle Miocene): An approach to their paleobiology.” Palaeogeography, Palaeoclimatology, Palaeoecology 237, no. 2–4 (August 4, 2006): 255–69. https://doi.org/10.1016/j.palaeo.2005.12.006.Full Text
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Kay, Richard F., and Mario Alberto Cozzuol. “New platyrrhine monkeys from the Solimões Formation (late Miocene, Acre State, Brazil).” Journal of Human Evolution 50, no. 6 (June 2006): 673–86. https://doi.org/10.1016/j.jhevol.2006.01.002.Full Text
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Tafforeau, P., R. Boistel, E. Boller, A. Bravin, M. Brunet, Y. Chaimanee, P. Cloetens, et al. “Applications of X-ray synchrotron microtomography for non-destructive 3D studies of paleontological specimens.” Applied Physics A: Materials Science and Processing 83, no. 2 (May 1, 2006): 195–202. https://doi.org/10.1007/s00339-006-3507-2.Full Text
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Fleagle, J. G., and R. F. Kay. “A new humerus of Homunculus from the Santa Cruz Formation, (early-middle Miocene, Patagonia).” Journal of Vertebrate Paleontology 26 (2006): 62A.
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Kay, R. F., and M. Cozzuol. “A new platyrrhine from the Solimões Formation (late Miocene, Acre State, Brazil) with comments about other Miocene monkeys from that region.” Journal of Human Evolution 50 (2006): 673–86.
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Vizcaino, Annabel J., S. F, S. Bargo, M. S, M. Kay, R. F, and R. Milne. “The armadillos (Mammalia, Xenarthra, Dasypodidae) of the Santa Cruz formation (early-middle Miocene).” Palaeogeography, Palaeoclimatology and Paleoecology 237 (2006): 255–69.
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Kay, R. F. “A synopsis of the phylogeny and paleobiology of Amphipithecidae, South Asian middle and late Eocene primates.” Anthropological Science 113, no. 1 (April 1, 2005): 33–42. https://doi.org/10.1537/ase.04S005.Full Text
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Kay, R. F., S. Vizcaino, A. A. Tauber, M. S. Bargo, B. A. Williams, C. Luna, and M. W. Colbert. “Three newly discovered skulls of Homunculus patagonicus support its position as a stem platyrrhine and establish its diurnal arboreal folivorous habits.” American Journal of Physical Anthropology, January 1, 2005, 127–127.Link to Item
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Kay, Richard F., Victoria M. Campbell, James B. Rossie, Matthew W. Colbert, and Tim B. Rowe. “Olfactory fossa of Tremacebus harringtoni (platyrrhini, early Miocene, Sacanana, Argentina): implications for activity pattern.” The Anatomical Record. Part A, Discoveries in Molecular, Cellular, and Evolutionary Biology 281, no. 1 (November 2004): 1157–72. https://doi.org/10.1002/ar.a.20121.Full Text
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Kohn, M. J., J. A. Josef, R. Madden, R. Kay, G. Vucetich, and A. A. Carlini. “Climate stability across the Eocene-Oligocene transition, southern Argentina.” Geology 32, no. 7 (July 1, 2004): 621–24. https://doi.org/10.1130/G20442.1.Full Text
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Bellosi, E. S., R. Madden, and R. F. Kay. “Discontinuidades estratigráficas de la Formación Sarmiento en Gran Barranca (Patagonia central): evaluación preliminary de la integridad de su registro.” Resumenes De Comunicaciones De La Asociación Argentina De Paleontologia (Diamante, Argentina) 2004 (2004): 6–7.
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Forasiepi, L. K., A. Sánchez-Villagra, M. R. Goin, F. J. Madden, F. J. R, M. Takai, M. Kay, and R. F. “A new hathliacynidae (Metatheria, Sparassodonta) from the middle Miocene of Quebrada Honda, Bolivia.” Journal of Vertebrate Paleontology, 2004.
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Kay, R. F. “A synopsis of the phylogeny and paleobiology of Amphipithecidae, South Asian middle and late Eocene primates.” Anthropological Science (Japan), 2004, 1–12.
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Kay, Richard F., Daniel Schmitt, Christopher J. Vinyard, Jonathan M. G. Perry, Nobuo Shigehara, Masanaru Takai, and Naoko Egi. “The paleobiology of Amphipithecidae, South Asian late Eocene primates.” Journal of Human Evolution 46, no. 1 (January 2004): 3–25. https://doi.org/10.1016/j.jhevol.2003.09.009.Full Text
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Madden, R., R. F. Kay, M. Heizler, F. Vilas, and G. Re. “Geochronology of the Sarmiento Formation at Gran Barranca and Elsewhere in Patagonia: Calibrating Middle Cenozoic Mammal Evolution in South America.” Journal of Vertebrate Paleontology 24 (2004): 87A.
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Tauber, A. A., R. F. Kay, C. Luna, and M. E. Palacoos. “Aspectos paleoambientales de la Formacion Santa Cruz (Mioeno temprano-medio) en Killik Aike Norte, Patagonia, Argentina.” Asociacion Paleontologica Argentina, Reunin Anual De Communicaciones, 2004, 26.
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Tauber, A. A., R. F. Kay, and C. Luna. “Killik Aike Norte, una localidad clásica de la Formación Santa Cruz (Mioceno temprano-medio), Patagonia, Argentina.” Ameghiniana Resúmenes, 2004 (2004): 26.
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Tauber, A. A., S. F. Vizcaino, R. F. Kay, M. S. Bargo, and C. Luna. “Aspectos biostratigráficos y paleoecológicos de la Formación Santa Cruz (Mioceno temprano-medio) de Patagonia, Argentina.” Ameghiniana, 2004.
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Vizcaino, S. F., M. S. Bargo, A. A. Tauber, and R. F. Kay. “The armadillos (Mammalia, Xenarthra) of the Santa Cruz Formation (Early-Middle Miocene). An approach to their paleobiology.” Ameghiniana, 2004.
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Ungar, P. S., M. F. Teaford, and R. F. Kay. “Molar micowear and shearing crest development in Miocene catarrhines.” Anthropologie 42 (2004): 21–35.
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Jungers, William L., Amy A. Pokempner, Richard F. Kay, and Matt Cartmill. “Hypoglossal canal size in living hominoids and the evolution of human speech.” Human Biology 75, no. 4 (August 2003): 473–84. https://doi.org/10.1353/hub.2003.0057.Full Text
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Goin, F. J., M. R. Sanchez-Villagra, R. F. Kay, F. Anaya-Daza, and M. Takai. “New Palaeothentid marsupial from the middle Miocene of Bolivia.” Palaeontology 46, no. 2 (January 1, 2003): 307–15. https://doi.org/10.1111/j.0031-0239.2003.00300.x.Full Text
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Kay, R. F., and T. R. T. Mitchell. “Cranial evidence for the timing of the catarrhine-platyrrhine divergence.” American Journal of Physical Anthropology Suppl. 35 (2003): 137.
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Kirk, E. C., M. Cartmill, R. F. Kay, and P. Lemelin. “Primate origins and carpolestid relationships: not nailed yet. Comment on Block and Boyer.” Science 300 (2003): 471.
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Bellosi, E. S., S. E. Miquel, R. F. Kay, and R. H. Madden. “A Mustersan Paleosol bearing land microgastropods (Charopidae) from the Sarmiento Formation, Eocene of Central Patagonia: Climatic implications.” Ameghiniana 39, no. 4 (December 30, 2002): 465–77.
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Holroyd, Patricia A., Russell L. Ciochon, Gregg F. Gunnell, Richard F. Kay, Masanaru Takai, and Marc Godinot. “What's in a name? Family-group taxonomy of larger-bodied Southeast Asian Eocene primates.” Journal of Human Evolution 43, no. 5 (November 2002): 755–58. https://doi.org/10.1006/jhev.2002.0589.Full Text
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Shigehara, Nobuo, Masanaru Takai, Richard F. Kay, Aye Ko Aung, Aung Naing Soe, Soe Thura Tun, Takehisa Tsubamato, and Tin Thein. “The upper dentition and face of Pondaungia cotteri from central Myanmar.” Journal of Human Evolution 43, no. 2 (August 2002): 143–66. https://doi.org/10.1006/jhev.2002.0567.Full Text
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Bellosi, E. S., S. E. Miquel, R. F. Kay, and R. H. Madden. “Un paleosuelo Mustersense con microgastrópodos terrestres (Charopidae) de la Formación Sarmiento, Eoceno de Patagonia central: significado paleoclimático.” Ameghiniana 39 (2002): 453–64.
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Bellosi, E. S., S. E. Miquel, R. F. Kay, and R. H. Madden. “A Mustersan Paleosol bearing land microgastropods (Charopidae) from the Sarmiento Formation, Eocene of Central Patagonia: Climatic implications.” Ameghiniana 39, no. 4 (2002): 465–77.
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Kay, R. F., D. Schmitt, and C. Vinyard. “Pondaungia cotteri, a slow moving primate seed predator from the Eocene of South Asia.” American Journal of Physical Anthropology Supplement 34 (2002): 92–93.
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Kirk, E. C., R. F. Kay, and W. L. Jungers. “Activity patterns of subfossil lemurs: evidence based on the relative size of the optic canal.” American Journal of Physical Anthropology, January 1, 2002, 96–96.Link to Item
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Kay, R. F., R. H. Madden, A. A. Carlini, E. S. Bellosi, M. Heizler, G. Ré, F. Vilas, and M. G. Vucetich. “The Mustersan interval at Gran Barranca.” Ameghiniana 38 (2001): 34R.
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Kay, R. F., R. H. Madden, E. S. Bellosi, A. A. Carlini, M. Heizler, G. Ré, F. Vilas, and M. G. Vucetich. “Puesto Almendra-Colhue-Huapi contact at Gan Barranca, Sarmiento Formation, Chubut, Argentina.” Ameghiniana 38 (2001): 35R.
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Williams, S. H., and R. F. Kay. “A comparative test of adaptive explanations for hypsodonty in ungulates and rodents.” Journal of Mammalian Evolution 8, no. 3 (January 1, 2001): 207–29. https://doi.org/10.1023/A:1012231829141.Full Text
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Kay, R. F., and E. C. Kirk. “Osteological evidence for the evolution of activity pattern and visual acuity in primates.” American Journal of Physical Anthropology 113, no. 2 (October 2000): 235–62. https://doi.org/10.1002/1096-8644(200010)113:2<235::aid-ajpa7>3.0.co;2-9.Full Text
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Kay, R. F. “Review of Adaptive Radiations of Neotropical Primates, edited by M. A. Norconk, A. L. Rosenberger, and P. A. Garber.” International Journal of Primatology 21 (2000): 325–27.
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Kay, R. F., and E. C. Kirk. “Ostological evidence for the evolution of activity pattern and visual acuity in primates.” American Journal of Physical Anthropology 113 (2000): 235–62.
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Sanchez-Villagra, M. R., R. J. Burnham, D. C. Campbell, R. M. Feldmann, E. S. Gaffney, R. F. Kay, R. Lozsan, R. Purdy, and J. G. M. Thewissen. “A new near-shore marine fauna and flora from the early neogene of northwestern Venezuela.” Journal of Paleontology 74, no. 5 (January 1, 2000): 957–68. https://doi.org/10.1017/s0022336000033126.Full Text
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Sänchez-Villagra, M. R., R. F. Kay, and F. Anaya-Daza. “Cranial anatomy and palaeobiology of the Miocene marsupial Hondalagus altiplanensis and a phylogeny of Argyrolagids.” Palaeontology 43, no. 2 (January 1, 2000): 287–301. https://doi.org/10.1111/1475-4983.00127.Full Text
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Kay, R. F., R. H. Madden, M. G. Vucetich, A. A. Carlini, M. M. Mazzoni, G. H. Re, M. Heizler, and H. Sandeman. “Revised geochronology of the Casamayoran South American Land Mammal Age: climatic and biotic implications.” Proceedings of the National Academy of Sciences of the United States of America 96, no. 23 (November 1999): 13235–40. https://doi.org/10.1073/pnas.96.23.13235.Full Text
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Carlini, A. A., M. G. Vucetich, M. Mazzoni, A. Zucol, G. H. Ré, J. F. A. Vilas, R. F. Kay, R. H. Madden, and M. Heizler. “Implications of the late Eocene age of the casamayoran fauna at Gran Barranca, Patagonia.” Journal of Vertebrate Paleontology 19, Suppl to #3 (1999): 35A.
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Kay, R. F., D. J. Johnson, and D. J. Meldrum. “Proteropithecia, new name for Propithecia Kay, Johnson and Meldrum, 1998 non Vojnits 1985.” American Journal of Primatology 47 (1999): 347.
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Kay, R. F., D. J. Johnson, and D. J. Meldrum. “Proteropithecia, new name for Propithecia.” American Juurnal of Primatology 47 (1999): 347.
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Kay, R. F., R. H. Madden, M. Mazzoni, M. G. Vucetich, G. Re, M. Heizler, and H. Sandeman. “The oldest Argentine primates: first age determinations for the Colhuehuapian South American Land Mammal 'Age'.” American Journal of Physical Anthropology, January 1, 1999, 166–166.Link to Item
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Williams, S. H., and R. F. Kay. “A comparative test of competing adaptive explanations for hypsodonty in ungulates and rodents.” Programa Y Resúmenes, Evolución Neotropical Del Cenozoico,La Paz, Bolivia, 1999, 46.
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Zack, S., R. F. Kay, and R. H. Madden. “New notoungulates from the Paleogene at Vilcapujio, Bolivia.” Journal of Vertebrate Paleontology 19, Suppl to #3 (1999): 86A.
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Kay, R. F. D., D. Johnson, and D. J. Meldrum. “Erratum: A new pitheciin primate from the middle Miocene of Argentina (American Journal of Primatology (1998) 45 (317-336)).” American Journal of Primatology 47, no. 4 (1999): 347-. https://doi.org/10.1002/(SICI)1098-2345(1999)47:4<347::AID-AJP6>3.0.CO;2-O.Full Text
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Ross, C., B. Williams, and R. F. Kay. “Phylogenetic analysis of anthropoid relationships.” Journal of Human Evolution 35, no. 3 (September 1998): 221–306. https://doi.org/10.1006/jhev.1998.0254.Full Text
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Kay, R. F., M. Cartmill, and M. Balow. “The hypoglossal canal and the origin of human vocal behavior.” Proceedings of the National Academy of Sciences of the United States of America 95, no. 9 (April 1998): 5417–19. https://doi.org/10.1073/pnas.95.9.5417.Full Text
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Gonzalez, W. G., R. F. Kay, and E. C. Kirk. “Optic canal and orbit size-- implications for the origins of diurnality and visual acuity in primates.” American Journal of Physical Anthropology Suppl 26 (1998): 87.
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Kay, R. F., B. J. Macfadden, R. H. Madden, H. Sandeman, and F. Anaya. “Revised age of the salla beds, Bolivia, and its bearing on the age of the deseadan South American land mammal “age”.” Journal of Vertebrate Paleontology 18, no. 1 (January 1, 1998): 189–99. https://doi.org/10.1080/02724634.1998.10011043.Full Text
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Kay, R. F., M. Cartmill, and M. Balow. “The hypoglossal canal and the origins of human vocal behavior.” American Journal of Physical Anthropology Suppl. 26 (1998): 137.
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Kay, R. F., D. Johnson, and D. J. Meldrum. “A new pitheciin primate from the middle Miocene of Argentina.” American Journal of Primatology 45, no. 4 (January 1998): 317–36. https://doi.org/10.1002/(sici)1098-2345(1998)45:4<317::aid-ajp1>3.0.co;2-z.Full Text
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Kay, R. F., C. Ross, B. A. Williams, and D. Johnson. “Cladistic analysis and anthropoid origins - Response.” Science 278, no. 5346 (December 19, 1997): 2135–36.Link to Item
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Kay, R. F., R. H. Madden, C. Van Schaik, and D. Higdon. “Primate species richness is determined by plant productivity: implications for conservation.” Proceedings of the National Academy of Sciences of the United States of America 94, no. 24 (November 1997): 13023–27. https://doi.org/10.1073/pnas.94.24.13023.Full Text
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Meldrum, D. J., and R. F. Kay. “Nuciruptor rubricae, a new pitheciin seed predator from the Miocene of Colombia.” American Journal of Physical Anthropology 102, no. 3 (March 1997): 407–27. https://doi.org/10.1002/(sici)1096-8644(199703)102:3<407::aid-ajpa8>3.0.co;2-r.Full Text
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Kay, R. F., C. Ross, and B. A. Williams. “Anthropoid origins.” Science (New York, N.Y.) 275, no. 5301 (February 1997): 797–804. https://doi.org/10.1126/science.275.5301.797.Full Text
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Kay, R. F., and R. H. Madden. “Mammals and rainfall: paleoecology of the middle Miocene at La Venta (Colombia, South America).” Journal of Human Evolution 32, no. 2–3 (February 1997): 161–99. https://doi.org/10.1006/jhev.1996.0104.Full Text
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Kay, R. F., C. Ross, B. A. Williams, and D. Johnson. “Cladistic analysis and Anthropoid Origins, reply to Block et al.” Science 278 (1997): 2135–36.
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Sánchez-Villagra, M. R., and R. F. Kay. “A skull of proargyrolagus, the oldest argyrolagid (late oligocene salla beds, bolivia), with brief comments concerning its paleobiology.” Journal of Vertebrate Paleontology 17, no. 4 (January 1, 1997): 717–24. https://doi.org/10.1080/02724634.1997.10011019.Full Text
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Allmendinger, R. W., T. E. Jordan, S. M. Kay, and B. L. Isacks. “The evolution of the Altiplano-Puna Plateau of the central Andes.” Annual Review of Earth and Planetary Sciences 25 (1997): 139–74.
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Melrum, D. J., and R. F. Kay. “Erratum: Nuciruptor rubicae, a new pitheciin seed predator from the miocene of Colombia (American Journal of Physical Anthropology (1997) 102 (407-427)).” American Journal of Physical Anthropology 104, no. 1 (1997): 153-. https://doi.org/10.1002/(SICI)1096-8644(199709)104:1<153::AID-AJPA11>3.0.CO;2-#.Full Text
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Carlini, A.A., R.H. Madden, G. López, R.F. Kay, M.G. Vucetich, M. Bond, T. Jordan, D. D. “Nuevos mamíferos de la Formación Chinches (Mioceno) de la Cordillera Frontal de San Juan, Argentina.” Resúmenes, Xii Jornadas Argentinas De Paleontología De Vertebrados (La Pampa, May 1996), 1996.
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Kay, R. F. “Review of Colobine Monkeys. Their ecology, behavior and evolution by A.G. Davies and J.F. Oates.” Science 271 (1996): 156–57.
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Sánchez-Vittagra, M. R., and R. F. Kay. “Do phalangeriforms (Marsupialia: Diprotodontia) have a 'hypocone'?” Australian Journal of Zoology 44, no. 5 (January 1, 1996): 461–67. https://doi.org/10.1071/zo9960461.Full Text
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Teaford, M. F., P. S. Ungar, R. F. Kay, and M. G. Leakey. “The evolution of diet in Old World monkeys.” American Journal of Physical Anthropology Suppl. 22 (1996): 227.
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Ungar, P. S., and R. F. Kay. “The dietary adaptations of European Miocene catarrhines.” Proceedings of the National Academy of Sciences of the United States of America 92, no. 12 (June 1995): 5479–81. https://doi.org/10.1073/pnas.92.12.5479.Full Text
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Kay, R. F., B. J. MacFadden, R. H. Madden, F. Anaya, and E. Farrar. “NEW RADIOMETRIC DATES CONFIRM LATE OLIGOCENE AGE OF DESEADAN SALLA BEDS, BOLIVIA AND THE OLDEST KNOWN SOUTH AMERICAN PRIMATE.” Journal of Vertebrate Paleontology 15 (January 1, 1995): 38A-38A.Link to Item
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Sanchez-Villagra, M. R., and R. F. Kay. “A SKULL OF PROARGYROLAGUS. THE OLDEST ARGYROLAGID (EARLY MIOCENE SALLA BEDS, BOLIVIA).” Journal of Vertebrate Paleontology 15 (January 1, 1995): 51A-52A.Link to Item
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Ungar, P. S., and R. F. Kay. “Molar Shear and dietary adaptations of European Miocene catarrhines.” American Journal of Physical Anthropology Suppl. 20 (1995): 214.
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Kay, R. F. “"Giant" tamarin from the Miocene of Colombia.” American Journal of Physical Anthropology 95, no. 3 (November 1994): 333–53. https://doi.org/10.1002/ajpa.1330950305.Full Text
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Kay, R. F. “"Giant" Tamarin from the Miocene of Colombia.” American Journal of Physcial Anthropology 13 (1994): 34–48.
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Kay, R. F., and B. A. Williams. “Cladistics, computers, and character analysis.” Evolutionary Anthropology 3 (1994): 32–35.
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Kay, R. F., and R. H. Madden. “An overview of the paleogeography and paleoecology of the La Venta region.” American Journal of Physical Anthropology Suppl. 18 (1994): 120.
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Williams, B. A., and R. F. Kay. “The taxon anthropoidea and the crown clade concept.” Evolutionary Anthropology: Issues, News, and Reviews 3, no. 6 (January 1, 1994): 188–90. https://doi.org/10.1002/evan.1360030603.Full Text
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Kay, R. F., and C. D. Frailey. “Fossil platyrrhines from the Rio Acre local fauna, late Miocene, western Amazonia.” Journal of Human Evolution 25 (December 1993): 319–27.
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Anthony, M. R. L., and R. F. Kay. “Tooth form and diet in ateline and alouattine primates: reflections on the comparative method.” American Journal of Science 293 A (January 1, 1993): 356–82. https://doi.org/10.2475/ajs.293.A.356.Full Text
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Kay, R. F., R. H. Madden, M. G. Vucetich, R. L. Cifelli, M. M. Mazzoni, and C. C. S. III. “Vertebrate paleontology in the Eocene of Bolivia and the Deseadan of Argentina.” Journal of Vertebrate Paleontology 13 (1993): 44A.
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Kay, R. F., and C. D. Frailey. “Large fossil platyrrhines from the Rio Acre local fauna, late Miocene, western Amazonia.” Journal of Human Evolution 25, no. 4 (January 1, 1993): 319–27. https://doi.org/10.1006/jhev.1993.1051.Full Text
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Kay, R. F., J. G. M. Thewissen, and A. D. Yoder. “Cranial anatomy of Ignacius graybullianus and the affinities of the Plesiadapiformes.” American Journal of Physical Anthropology 89, no. 4 (January 1, 1992): 477–98. https://doi.org/10.1002/ajpa.1330890409.Full Text
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Meldrum, D. J., and R. F. Kay. “A new specimen of pitheciine primate from the Miocene of Colombia.” American Journal of Physical Anthropology Supplement 14 (1992): 121.
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Kay, R. F. “Review of Primate Phylogeny by F.E. Grine, J.G. Fleagle and L.B. Martin.” American Journal of Physical Anthropology 84 (1991): 109–11.
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Kay, R. F., and M. R. L. Anthony. “Tooth form and diet in ateline and alouattine primates: reflections on the comparative method.” Journal of Vertebrate Paleontology 11 (1991): 39A.
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Madden, R. H., and R. F. Kay. “The Friasian of Patagonia.” Journal of Vertebrate Paleontology 11 (1991): 44A.
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Kay, Richard F. “Primate phylogeny. Edited by F.E. Grine, J.G. Fleagle, and L.B. Martin. London: Academic Press. 1987. iii + 146 pp., tables, figures, $7.95 (paper).” American Journal of Physical Anthropology 84, no. 1 (January 1991): 109–11. https://doi.org/10.1002/ajpa.1330840120.Full Text
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Meldrum, D. J., J. G. Fleagle, and R. F. Kay. “Partial humeri of two Miocene Colombian primates.” American Journal of Physical Anthropology 81, no. 3 (March 1990): 413–22. https://doi.org/10.1002/ajpa.1330810310.Full Text
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MELDRUM, D. J., and R. F. KAY. “A NEW PARTIAL SKELETON OF CEBUPITHECIA-SARMIENTOI FROM THE MIOCENE OF COLOMBIA.” American Journal of Physical Anthropology 81, no. 2 (February 1, 1990): 267–267.Link to Item
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Kay, R. F. “The phyletic relationships of extant and fossil Pitheciinae (Platyrrhini, Anthropoidea).” Journal of Human Evolution 19, no. 1–2 (January 1, 1990): 175–208. https://doi.org/10.1016/0047-2484(90)90016-5.Full Text
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Kay, R. F., R. W. Thorington, and P. Houde. “Eocene plesiadapiform shows affinities with flying lemurs not primates.” Nature 345, no. 6273 (January 1, 1990): 342–44. https://doi.org/10.1038/345342a0.Full Text
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Kay, D. D., R. F, R. H. Madden, and J. G. D. “Nuevos hallazgos de monos del Mioceno de Colombia.” Ameghiniana 25 (1990): 203–13.
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FLEAGLE, J. G., and R. F. KAY. “THE DENTAL MORPHOLOGY OF DOLICHOCEBUS-GAIMANENSIS, A FOSSIL MONKEY FROM ARGENTINA.” American Journal of Physical Anthropology 78, no. 2 (February 1, 1989): 221–221.Link to Item
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KAY, R. F. “A NEW SMALL PLATYRRHINE FROM THE MIOCENE OF COLOMBIA AND THE PHYLETIC POSITION OF THE CALLITRICHINES.” American Journal of Physical Anthropology 78, no. 2 (February 1, 1989): 251–251.Link to Item
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MADDEN, R. H., R. F. KAY, and J. GUERRERO. “NEW STIRTONIA-VICTORIAE MATERIAL FROM THE MIOCENE OF COLOMBIA.” American Journal of Physical Anthropology 78, no. 2 (February 1, 1989): 265–265.Link to Item
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Kay, R. F. “A new small platyrrhine from the Miocene of Colombia and the phyletic position of the callitrichines.” American Journal of Physical Anthropology 78 (1989): 151.
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Kay, R. F. “A new "giant" tamarin from the Miocene of Colombia.” Journal of Vertebrate Paleontology 9 (1989): 28A.
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Madden, R. H., R. F. Kay, J. F. Lundberg, and G. Scillato-Yane. “Vertebrate paleontology, stratigraphy, and biochronology of the Miocene of southern Ecuador.” Journal of Vertebrate Paleontology 9 (1989): 31A.
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Kay, R. F. “Review of Primate Adaptation and Evolution by J.G. Fleagle.” Quarterly Review of Biology 64 (1989): 344.
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Kay, R. F., J. M. Plavcan, K. E. Glander, and P. C. Wright. “Sexual selection and canine dimorphism in New World monkeys.” American Journal of Physical Anthropology 77, no. 3 (November 1988): 385–97. https://doi.org/10.1002/ajpa.1330770311.Full Text Open Access Copy
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Grine, F. E., and R. F. Kay. “Early hominid diets from quantitative image analysis of dental microwear.” Nature 333, no. 6175 (June 1988): 765–68. https://doi.org/10.1038/333765a0.Full Text
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Plavcan, J. M., and R. F. Kay. “Sexual dimorphism and dental variability in platyrrhine primates.” International Journal of Primatology 9, no. 3 (June 1, 1988): 169–78. https://doi.org/10.1007/BF02737399.Full Text
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KAY, R. F., and J. G. FLEAGLE. “THE PHYLOGENETIC POSITION OF PARAPITHECIDAE (PRIMATES, ANTHROPOIDEA).” American Journal of Physical Anthropology 75, no. 2 (February 1, 1988): 230–230.Link to Item
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Kay, R. F. “Phyletic Position of the Pitheciinae.” Journal of Vertebrate Paleontology 8 (Suppl. 3) (1988): 19a.
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Kay, Richard F., and John G. H. Cant. “Age assessment using cementum annulus counts and tooth wear in a free-ranging population of Macaca mulatta.” American Journal of Primatology 15, no. 1 (January 1988): 1–15. https://doi.org/10.1002/ajp.1350150103.Full Text
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Madden, R. H., R. F. Kay, J. G. Lundberg, R. L. Cifelli, and J. Guerrero. “Informe general de nuevos descubrimientos en el Mioceno de Colombia y Chile.” V. Journadas Arg. Paleont. Vert., 1988.
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Simons, E. L., and R. F. Kay. “New material of Qatrania from Egypt with comments on the phylogenetic position of the parapithecidae (primates, Anthropoidea).” American Journal of Primatology 15, no. 4 (January 1988): 337–47. https://doi.org/10.1002/ajp.1350150407.Full Text
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Kay, R. F. “Analysis of primate dental microwear using image processing techniques.” Scanning Microscopy 1, no. 2 (June 1987): 657–62.
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KAY, R. F., J. M. PLAVCAN, P. C. WRIGHT, K. E. GLANDER, and G. H. ALBRECHT. “BEHAVIORAL AND SIZE CORRELATES OF CANINE DIMORPHISM IN PLATYRRHINE PRIMATES.” American Journal of Physical Anthropology 72, no. 2 (February 1, 1987): 218–218.Link to Item
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PLAVCAN, J. M., R. F. KAY, and G. H. ALBRECHT. “SEXUAL DIMORPHISM AND DENTAL VARIABILITY AMONG EXTANT PLATYRRHINES.” American Journal of Physical Anthropology 72, no. 2 (February 1, 1987): 243–243.Link to Item
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Fleagle, J. G., and R. F. Kay. “The phyletic position of the Parapithecidae.” Journal of Human Evolution 16, no. 6 (January 1, 1987): 483–532. https://doi.org/10.1016/0047-2484(87)90036-4.Full Text
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Kay, R. F., R. H. Madden, J. M. Plavcan, R. L. Cifelli, and J. G. Díaz. “Stirtonia victoriae, a new species of Miocene Colombian primate.” Journal of Human Evolution 16, no. 2 (January 1, 1987): 173–96. https://doi.org/10.1016/0047-2484(87)90075-3.Full Text
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Kay, R. F. “Major Topics in Primate and Human Evolution, edited by B. Wood, L. Martin and P. Andrews, review.” American Scientist 75 (1987): 312.
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KAY, R. F., R. M. MADDEN, R. L. CIFELLI, and J. G. DIAZ. “A NEW SPECIMEN OF MIOCENE COLOMBIAN STIRTONIA.” American Journal of Physical Anthropology 69, no. 2 (February 1, 1986): 221–221.Link to Item
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Kay, C. N., R. P. Scapino, and E. D. Kay. “A cinephotographic study of the role of the canine in limiting lateral jaw movements in Macaca fascicularis.” Journal of Dental Research 65 (1986): 1300–1302.
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Luchterhand, K., R. F. Kay, and R. H. Madden. “Mohanamico hershkovitzi, gen. et sp. nov., un primate du Miocène moyen d'Amérique du Sud.” Comptes Rendus, Adademie Des Sciences (Paris) 303, no. II (1986): 1753–58.
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Luchterhand, K., R. F. Kay, and R. H. Madden. “( Mohanamico herskovitzi gen. et sp. nov., a middle Miocene South American primate).” Comptes Rendus Academie Des Sciences, Series Ii 303, no. 19 (January 1, 1986): 1753–58.
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Lundberg, J. G., A. Machado-Allison, and R. F. Kay. “Miocene characid fishes from Colombia: Evolutionary stasis and extirpation.” Science 234, no. 4773 (January 1, 1986): 205–8.
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Lundberg, J. G., A. Machado Allison, and R. F. Kay. “Miocene characid fishes from Colombia: evolutionary stasis and extirpation.” Science 234 (1986): 208–9.
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KAY, R. F., and J. G. H. CANT. “CEMENTUM ANNULUS COUNTS AND CHRONOLOGICAL AGE IN MACACA-MULATTA.” American Journal of Physical Anthropology 66, no. 2 (January 1, 1985): 188–188.Link to Item
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Kay, R. F. “Dental evidence for the diet of Australopithecus.” Annual Review of Anthropology. Vol. 14, January 1, 1985, 315–41. https://doi.org/10.1146/annurev.an.14.100185.001531.Full Text
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Kay, R. F. “Review of A Complete Guide to the Monkeys, Apes and Other Primates by M. Kavanagh.” Quarterly Review of Biology 60 (1985): 231.
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ALBRECHT, G. H., and R. F. KAY. “PORTABLE MICROCOMPUTERS, ELECTRONIC DIGITAL CALIPERS, AND THE COLLECTION OF MORPHOMETRIC DATA.” American Journal of Physical Anthropology 63, no. 2 (January 1, 1984): 133–34.Link to Item
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Kay, R. F., D. T. Rasmussen, and K. C. Beard. “Cementum annulus counts provide a means for age determination in Macaca mulatta (primates, anthropoidea).” Folia Primatologica; International Journal of Primatology 42, no. 2 (January 1984): 85–95. https://doi.org/10.1159/000156152.Full Text
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Kay, R. F. “The Order of Man by Charles Oxnard, review.” Quarterly Review of Biology 59 (1984): 480–81.
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Kay, R. F., D. T. Rasmussen, and K. C. Beard. “Cementum annulus counts provide a mean for age determination in Macaca mulatta.” Folia Primatologica 42 (1984): 85–95.
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Kay, R. F., and E. L. Simons. “Dental formulae and dental eruption patterns in Parapithecidae (Primates, Anthropoidea).” American Journal of Physical Anthropology 62, no. 4 (December 1983): 363–75. https://doi.org/10.1002/ajpa.1330620403.Full Text
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Simons, E. L., and R. F. Kay. “Qatrania, new basal anthropoid primate from the Fayum, Oligocene of Egypt.” Nature 304, no. 5927 (December 1, 1983): 624–26. https://doi.org/10.1038/304624a0.Full Text
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Kay, R. F., and H. H. Covert. “True grit: a microwear experiment.” American Journal of Physical Anthropology 61, no. 1 (May 1983): 33–38. https://doi.org/10.1002/ajpa.1330610104.Full Text
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Kay, Richard F. “RAMAPITHECUS RECLAIMED.” The Sciences 23, no. 1 (January 2, 1983): 26–27. https://doi.org/10.1002/j.2326-1951.1983.tb03729.x.Full Text
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Kay, R. F. “Sivapithecus simonsi, a new species of miocene hominoid, with comments on the phylogenetic status of the ramapithecinae.” International Journal of Primatology 3, no. 2 (June 1, 1982): 113–73. https://doi.org/10.1007/BF02693493.Full Text
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Sheine, W. S., and R. F. Kay. “A model for comparison of masticatory effectiveness in primates.” Journal of Morphology 172, no. 2 (May 1982): 139–49. https://doi.org/10.1002/jmor.1051720202.Full Text
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Kay, R. F. “Sexual dimorphism in Ramapithecinae.” Proceedings of the National Academy of Sciences of the United States of America 79, no. 2 (January 1982): 209–12. https://doi.org/10.1073/pnas.79.2.209.Full Text
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Kay, R. F., M. Cartmill, and R. D. E. MacPhee. “Habitus and heritage in archaic primates (Plesiadapiformes).” International Journal of Primatology 3 (1982): 302.
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Kay, R. F. “Advances in San Juan Basin Paleontology by Lucas, et al., an review.” American Scientist 70 (1982): 318.
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Fleagle, J. G., R. F. Kay, and E. L. Simons. “Sexual dimorphism in early anthropoids: response to Leutenegger.” Naure 290 (December 1981): 609.
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Covert, H. H., and R. F. Kay. “Dental microwear and diet: implications for determining the feeding behaviors of extinct primates, with a comment on the dietary pattern of Sivapithecus.” American Journal of Physical Anthropology 55, no. 3 (July 1981): 331–36. https://doi.org/10.1002/ajpa.1330550307.Full Text
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Kay, R. F. “The nut‐crackers – a new theory of the adaptations of the Ramapithecinae.” American Journal of Physical Anthropology 55, no. 2 (January 1, 1981): 141–51. https://doi.org/10.1002/ajpa.1330550202.Full Text
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Kay, R. F. “The ontogeny of premolar dental wear in Cercocebus albigena (cercopithecidae).” American Journal of Physical Anthropology 54, no. 1 (January 1, 1981): 153–55. https://doi.org/10.1002/ajpa.1330540119.Full Text
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Kay, R. F., J. G. Fleagle, and E. L. Simons. “A revision of the Oligocene apes of the Fayum Province, Egypt.” American Journal of Physical Anthropology 55, no. 3 (January 1, 1981): 293–322. https://doi.org/10.1002/ajpa.1330550305.Full Text
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Leutenegger, W., J. G. Fleagle, R. F. Kay, and E. L. Simons. “Sexual dimorphism in early anthropoids.” Nature 290, no. 5807 (1981): 609-.
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Fleagle, J. G., R. F. Kay, and E. L. Simons. “Sexual dimorphism in early anthropoids.” Nature 287, no. 5780 (September 1980): 328–30. https://doi.org/10.1038/287328a0.Full Text
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COVERT, H. H., and R. F. KAY. “DENTAL MICROWEAR AND DIET - IMPLICATIONS FOR EARLY HOMINID FEEDING-BEHAVIOR.” American Journal of Physical Anthropology 52, no. 2 (January 1, 1980): 216–216.Link to Item
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Kay, R. F. “Documenting our antecedents--A review of F. Szalay and E. Delson's book: Evolutionary History of the Primates.” Paleobiology 6 (1980): 517–20.
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Kay, R. F., and E. L. Simons. “Comments on the adaptive strategy of the first African anthropoids.” Zeitschrift Fur Morphologie Und Anthropologie 71, no. 2 (January 1980): 143–48.
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SIMONS, E. L., and R. F. KAY. “DAWN APE PROVIDES CLUE TO SOCIAL-LIFE.” Geotimes 25, no. 5 (January 1, 1980): 18–18.Link to Item
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Kay, R. F., and E. L. Simons. “The ecology of Oligocene African Anthropoidea.” International Journal of Primatology 1 (1980): 21–37.
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Kay, R. F., and E. L. Simons. “Ecology of Oligocene African Anthropoidea.” American Journal of Physical Anthropology 50 (1979): 453–453.
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Kay, R. F., and W. S. Sheine. “On the relationship between chitin particle size and digestibility in the primate Galago senegalensis.” Am. J. Phys. Anthropol. 50 (1979): 301–8.
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Kay, R. F., R. W. Sussman, and I. Tattersall. “Dietary and dental variations in the genus Lemur, with comments concerning dietary-dental correlations among Malagasy primates.” American Journal of Physical Anthropology 49, no. 1 (July 1978): 119–27. https://doi.org/10.1002/ajpa.1330490118.Full Text
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Kay, R. F., and W. S. Sheine. “A model for the comparison of mastication efficiency in primates.” American Journal of Physical Anthropology 48 (1978): 110–11.
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Kay, R. F. “Diets of early Miocene African hominoids.” Nature 268, no. 5621 (December 1, 1977): 628–30. https://doi.org/10.1038/268628a0.Full Text
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Kay, R. F. “The evolution of molar occlusion in the Cercopithecidae and early Catarrhines.” American Journal of Physical Anthropology 46, no. 2 (March 1977): 327–52. https://doi.org/10.1002/ajpa.1330460213.Full Text
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Kay, R. F., and M. Cartmill. “Cranial morphology and adaptations of Palaechthon nacimienti and other paromomyidae (Plesiadapoidea, ? primates), with a description of a new genus and species.” Journal of Human Evolution 6, no. 1 (January 1, 1977). https://doi.org/10.1016/S0047-2484(77)80040-7.Full Text
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Sheine, W. S., and R. F. Kay. “An analysis of chewed food particle size and its relationship to molar structure in the primatesCheirogaleus medius andGalago senegalensis and the insectivoranTupaia glis.” American Journal of Physical Anthropology 47, no. 1 (January 1, 1977): 15–20. https://doi.org/10.1002/ajpa.1330470106.Full Text
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Kay, R. F. “Evolution of molar function in catarrhines.” American Journal of Physical Anthropology 44 (1976): 190.
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Kay, R. F. “Prosimian Biology, a review.” American Scientist, 1976.
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Hylander, W., and R. F. Kay. “Maxillary premolar reduction in the golden monkey.” Journal of Dental Research 54 (December 1975): 1242.
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Kay, R. F. “The functional adaptations of primate molar teeth.” American Journal of Physical Anthropology 43, no. 2 (September 1975): 195–216. https://doi.org/10.1002/ajpa.1330430207.Full Text
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“Letter: Allometry and early hominids.” Science (New York, N.Y.) 189, no. 4196 (July 1975): 61–64.
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KAY, R. F. “ALLOMETRY AND EARLY HOMINIDS - COMMENT.” Science 189, no. 4196 (January 1, 1975): 63–63.Link to Item
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KAY, R. F., and M. CARTMILL. “SKULL OF PALAECHTHON AND COMMENTS ON ECOLOGICAL ADAPTATIONS OF PLESIADAPOIDEA.” American Journal of Physical Anthropology 42, no. 2 (January 1, 1975): 311–311.Link to Item
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Hylander, W. L., and R. F. Kay. “Maxillary premolar reduction in the golden monkey (Rhinopithecus roxellanae).” Journal of Dental Research 54 (1975): 1242.
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Kay, R. F. “Body size, molar structure and diet in primates.” American Journal of Physical Anthropology 41 (December 1974): 487–88.
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Kay, R. F., and M. Cartmill. “Skull of Palaechthon nacimienti.” Nature 252, no. 5478 (December 1, 1974): 37–38. https://doi.org/10.1038/252037a0.Full Text
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Kay, R. F., and K. M. Hiiemae. “Jaw movement and tooth use in recent and fossil primates.” American Journal of Physical Anthropology 40, no. 2 (March 1974): 227–56. https://doi.org/10.1002/ajpa.1330400210.Full Text
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Kay, R. F. “Letter: Humerus of robust Australopithecus.” Science (New York, N.Y.) 182, no. 4110 (October 1973): 396. https://doi.org/10.1126/science.182.4110.396.Full Text
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Kay, R. F. “Mastication, Molar Tooth Structure and Diet in Primates.” Dissertation Abstracts International B34 (1973): 5293.
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Book Sections
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Kay, R. F., and F. E. Grine. “Tooth morphology, wear and diet in australopithecus and paran thropus from Southern Africa.” In Evolutionary History of the “Robust” Australopithecines, 427–47, 2017. https://doi.org/10.4324/9780203792667.Full Text
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Kay, R. F., D. J. Meldrum, and M. Takai. “Pitheciidae and other platyrrhine seed predators.” In Evolutionary Biology and Conservation of Titis, Sakis and Uacaris., edited by L. Veiga, A. A. Barnett, S. F. Ferrari, and M. A. Norconk, 3–12. Cambridge, UK: Cambridge University Press, 2013.
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Kay, R. F., J. M. G. Perry, M. D. Malinzak, K. L. Allen, E. C. Kirk, J. M. Plavcan, and J. G. Fleagle. “The paleobiology of Santacrucian primates.” In Early Miocene Paleobiology in Patagonia: High-Latitude Paleocommunities of the Santa Cruz Formation, edited by S. F. Vizcaíno, R. F. Kay, and M. S. Bargo, 306–30. Cambridge, UK: Cambridge University Press, 2012.
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Kay, R. F., S. F. Vizcaíno, and M. S. Bargo. “A review of the paleoenvironment and paleoecology of the Miocene Santa Cruz Formation.” In Early Miocene Paleobiology in Patagonia: High-Latitude Paleocommunities of the Santa Cruz Formation, edited by S. F. Vizcaíno, R. F. Kay, and M. S. Bargo, 331–64. Cambridge, UK: Cambridge University Press, 2012.
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Vizcaíno, S. F., R. F. Kay, and M. S. Bargo. “Background for a paleoecological study of the Santa Cruz Formation (late Early Miocene) on the Atlantic Coast of Patagonia.” In Early Miocene Paleobiology in Patagonia: High-Latitude Paleocommunities of the Santa Cruz Formation, edited by S. F. Vizcaíno, R. F. Kay, and M. S. Bargo, 1–22. Cambridge, UK: Cambridge University Press, 2012.
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Kay, R. F. “A New Primate from the Early Miocene of Gran Barranca, Chubut Province, Argentina: Paleoecological Implications.” In The Paleontology of Gran Barranca: Evolution and Environmental Change through the Middle Cenozoic of Patagonia, edited by R. H. Madden, G. Vucetich, A. A. Carlini, and R. F. Kay, 220–39. Cambridge: Cambridge University Press, 2010.
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Madden, R. H., A. A. Carlini, M. G. Vucetich, and R. F. Kay. “Gran Barranca: a twenty-three million year record of Middle-Cenozoic faunal evolution in Patagonia.” In The Paleontology of Gran Barranca: Evolution and Environmental Change through the Middle Cenozoic of Patagonia, edited by R. H. Madden, G. Vucetich, A. A. Carlini, and R. F. Kay. Cambridge: Cambridge University Press, 2010.
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Madden, R. H., A. A. Carlini, M. G. Vucetich, and R. F. Kay. “Gran Barranca: a twenty-three million year record of Middle-Cenozoic faunal evolution in Patagonia.” In The Paleontology of Gran Barranca: Evolution and Environmental Change through the Middle Cenozoic of Patagonia, edited by R. H. Madden, G. Vucetich, A. A. Carlini, and R. F. Kay. Cambridge: Cambridge University Press, 2010.
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Madden, R. H., A. A. Carlini, M. G. Vucetich, and R. F. Kay. “Preface to The Paleontology of Gran Barranca: Evolution and Environmental Change through the Middle Cenozoic of Patagonia.” In The Paleontology of Gran Barranca: Evolution and Environmental Change through the Middle Cenozoic of Patagonia, edited by R. H. Madden, A. A. Carlini, M. G. Vucetich, and R. F. Kay, ix–x. Cambridge, UK: Cambridge University Press, 2010.
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Ré, G. H., E. S. Bellosi, M. Heizler, J. F. Vilas, R. H. Madden, A. A. Carlini, R. F. Kay, and M. G. Vucetich. “A geochronology for the Sarmiento Formation at Gran Barranca.” In The Paleontology of Gran Barranca: Evolution and Environmental Change through the Middle Cenozoic of Patagonia, edited by R. H. Madden, G. Vucetich, A. A. Carlini, and R. F. Kay, 46–60. Cambridge: Cambridge University Press, 2010.
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Teaford, M., P. Ungar, and R. F. Kay. “Molar shape and molar microwear in the Koobi Fora monkeys: ecomorphological implications.” In Koobi Fora Research Project, Volume VI, The Fossil Monkeys, edited by N. Jablonski and M. G. Leakey, 337–58. San Francisco: California Academy of Sciences, 2008.
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Kay, R. F., B. A. Williams, C. F. Ross, M. Takai, and N. Shigehara. “Anthropoid origins: a phylogenetic analysis.” In Anthropoid Origins: New Visions, edited by C. F. Ross and R. F. Kay, 91–135. New York: Kluwer/Plenum, 2004.
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Kirk, E. C., and R. F. Kay. “The evolution of high visual acuity in the Anthropoidea.” In Anthropoid Origins: New Visions, edited by C. F. Ross and R. F. Kay, 539–602. New York: Kluwer/Plenum Publishing, 2004.
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Ross, C. F., and R. F. Kay. “Evolving perspectives on Anthropoidea.” In Anthropoid Origins: New Visions, edited by C. F. Ross and R. F. Kay, 3–41. New York: Kulwer/Plenum, 2004.
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Ross, C. F., and R. Kay. “Anthropoid Origins: Retrospective and Prospective.” In Anthropoid Origins: New Visions, edited by C. F. Ross and R. F. Kay, 699–737. New York: Kluwer/Plenum Publishing, 2004.
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Kay, R. F., B. A. Williams, and F. Anaya. “The adaptations of Branisella boliviana, the earliest South American monkey.” In Reconstructing Behavior in the Primate Fossil Record, edited by J. M. Plavcan, C. van Schaik, R. F. Kay, and W. L. Jungers, 339–70. New York: Kluwer Academic/Plenum Publishers, 2002.
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Kay, R. F. “Diet.” In Encyclopedia of Evolution and Prehistory, 2nd Edition, edited by E. Delson, I. Tattersall, J. A. VanCouvering, and A. Brooks, 208–12. New York: Garland Pub. Co., 2000.
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Kay, R. F. “Parapithecidae.” In Encyclopedia of Evolution and Prehistory, 2nd Edition, edited by E. Delson, I. Tattersall, J. A. VanCouvering, and A. Brooks, 545–48. New York: Garland Pub. Co., 2000.
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Kay, R. F. “Teeth.” In Encyclopedia of Evolution and Prehistory, 2nd Edition, edited by E. Delson, I. Tattersall, J. A. V. Couvering, and A. Brooks, 695–703. New York: Garland Pub. Co., 2000.
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Kay, R. F., and E. Delson. “Oligopithecidae.” In Encyclopedia of Evolution and Prehistory, 2nd Edition, edited by E. Delson, I. Tattersall, J. A. VanCouvering, and A. Brooks, 490–93. New York: Garland Pub. Co., 2000.
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Kay, R. F., and J. A. Van Couvering. “Fayum.” In Encyclopedia of Evolution and Prehistory, 2nd Edition, edited by E. Delson, I. Tattersall, J. A. VanCouvering, and A. Brooks, 265–67. New York: Garland Pub. Co, 2000.
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Van Couvering, J. A., and R. F. Kay. “Oligocene.” In Encyclopedia of Evolution and Prehistory, 2nd Edition, edited by E. Delson, I. Tattersall, J. A. VanCouvering, and A. Brooks, 489–90. New York: Garland Pub. Co, 2000.
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Fleagle, J. G., R. F. Kay, and M. R. L. Anthony. “Fossil New World monkeys.” In Mammalian Evolution in the Neotropics, edited by R. F. Kay, R. H. Madden, R. L. Cifelli, and J. J. Flynn, 473–95. Washington, D. C.: Smithsonian Institution Press, 1997.
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Fleagle, J. G., and R. F. Kay. “Platyrrhines, catarrhines and the fossil record.” In New World Primates: Ecology, Evolution and Behavior, edited by W. G. Kinzey, 3–24. New York: Aldine, 1997.
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Kay, R. F., and D. J. Meldrum. “A new small platyrrhine from the Miocene of Colombia and the phyletic position of Callitrichinae.” In Vertebrate Paleontology in the Neotropics, edited by R. F. Kay, R. H. Madden, R. L. Cifelli, and J. J. Flynn, 435–58. Washington, D.C.: Smithsonian Institution Press, 1997.
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Kay, R. F., and P. Ungar. “Dental evidence for diet in some Miocene catarrhines with comments on the effects of phylogeny on the interpretation of adaptation.” In Function, Phylogeny and Fossils: Miocene Hominoids and Great Ape and Human Origins, edited by D. R. Begun, C. Ward, and M. Rose, 131–51. New York: Plenum Press, 1997.
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Kay, R. F., and R. H. Madden. “Paleogeography and paleoecology.” In Mammalian Evolution in the Neotropics, edited by R. F. Kay, R. H. Madden, R. L. Cifelli, and J. J. Flynn, 520–50. Washington, D. C.: Smithsonian Institution Press, 1997.
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Madden, R. H., J. Guerrero, R. F. Kay, J. J. Flynn, C. C. Swisher III, and A. H. Walton. “The Laventan Stage and Laventan Age: New chronostratigraphic and geochronologic units for the Miocene of South America.” In Vertebrate Paleontology in the Neotropics., edited by R. F. Kay, R. H. Madden, R. L. Cifelli, and J. J. Flynn, 499–519. Washington, D. C.: Smithsonian Institution Press, 1997.
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Meldrum, D. J., and R. F. Kay. “The postcranial skeleton of Miocene platyrrhine primates.” In Vertebrate Paleontology in the Neotropics, edited by R. F. Kay, R. H. Madden, R. L. Cifelli, and J. J. Flynn, 459–72. Washington, D.C.: Smithsonian Institution Press, 1997.
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Fleagle, J. G., and R. F. Kay. “Anthropoid origins: past, present, and future.” In Anthropoid Origins: The Fossil Evidence, edited by J. G. Fleagle and R. F. Kay, 675–98. New York: Plenum Press, 1994.
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Kay, R. F., and B. A. Williams. “Dental evidence for anthropoid origins.” In Anthropoid Origins: The Fossil Evidence, edited by J. G. Fleagle and R. F. Kay, 361–446. New York: Plenum Press, 1994.
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Kay, R. F., and B. A. Williams. “Dental evidence for anthropoid origins,” Suppl. 14:98, 1992.
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Rasmussen, D. T., and R. F. Kay. “A Miocene Anhinga from Colombia, and comments on the zoogeographic relationships of South America's Tertiary avifanua.” In Avian Paleontology, edited by K. E. Campell, 225–30. Los Angeles: Special Publication, Nat. Hist. Mus. of Los Angeles County, Los Angeles, 1992.
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Kay, R. F., and F. E. Grine. “Tooth Morphology, wear, and diet in Austrolopithecus and Paranthropus.” In Evolutionary History of the “Robust” Austrolopithecines, edited by F. E. Grine, 427–47. New York: Aldine de Gruyter, 1989.
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Kay, R. F. “Fayum.” In Encyclopedia of Human Evolution and Prehistory, edited by I. Tattersal, E. Delson, and J. VanCouvering, 205–6. New York: Garland Pub., 1988.
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Kay, R. F. “Oligocene.” In Encyclopedia of Human Evolution and Prehistory, edited by I. Tattersal, E. Delson, and J. VanCouvering, 392–94. New York: Garland Pub., 1988.
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Kay, R. F. “Diet.” In Encyclopedia of Human Evolution and Prehistory, edited by I. Tattersal, E. Delson, and J. VanCouvering, 155–59. New York: Garland Pub., 1988.
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Kay, R. F. “Teeth.” In Encyclopedia of Human Evolution and Prehistory, edited by I. Tattersal, E. Delson, and J. VanCouvering, 571–78. New York: Garland Pub., 1988.
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Kay, R. F. “Parapithecidae.” In Encyclopedia of Human Evolution and Prehistory, edited by I. Tattersal, E. Delson, and J. VanCouvering, 440–43. New York: Garland Pub., 1988.
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Fleagle, J. G., and R. F. Kay. “The paleobiology of catarrhines.” In Ancestors: The Hard Evidence, edited by E. Delson, 23–36. New York: Alan R. Liss, Inc., 1985.
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Kay, R. F. “On the use of anatomical features to infer foraging behavior in extinct primates.” In Adaptations for Foraging in Nonhuman Primates, edited by J. Cant and P. Rodman, 21–53. New York: Columbia University Press, 1984.
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Kay, R. F., and H. H. Covert. “Anatomy and behaviour of extinct primates.” In Food Acquisition and Processing in Primates, edited by D. J. Chivers, B. A. Wood, and A. Bilsborough, 467–508. New York: Plenum Press, 1984.
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Fleagle, J. G., and R. F. Kay. “New interpretations of the phyletic position of Oligocene hominoids.” In New Interpretations of Ape and Human Ancestry, edited by R. L. Ciochon and R. S. Corruccini, 181–210. New York and London: Plenum Press, 1983.
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Kay, R. F., and E. L. Simons. “A reassessment of the relationship between later Miocene and subsequent Hominoidea.” In New Interpretations of Ape and Human Ancestry, edited by R. L. Ciochon and R. S. Corruccini, 577–624. New York: Plenum Press, 1983.
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Kay, R. F. “Ramapithecines and Human Origins.” In McGraw-Hill Yearbook of Science and Technology, 1–11, 1982.
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Kay, R. F., and E. L. Simons. “Apidium and Parapithecus.” In McGraw-Hill Yearbook of Science and Technology, 103–5, 1981.
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Simons, E. L., and R. F. Kay. “Aegyptopithecus and Propliopithecus.” In McGraw-Hill Yearbook of Science and Technology, 77–80, 1981.
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Kay, R. F. “Platyrrhine origins: a reappraisal of the dental evidence.” In Evolutionary Biology of the New World Monkeys and Continental Drift, edited by R. Ciochon and B. Chiarelli, 159–88. New York: Plenum Press, 1980.
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Cartmill, M., and R. F. Kay. “Craniodental morphology, tarsier affinities, and primate suborders.” In Recent Advances in Primatology: Evolution, edited by D. J. Chivers and K. A. Joysey, 205–14. London: Academic Press, 1978.
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Fleagle, J. G., and R. F. Kay. “New interpretations of the phyletic position of Oligocene hominoids.” In New Interpretations of Ape and Human Ancestry, edited by R. L. Ciochon and R. S. Corruccini, 181–210. New York: Plenum Press, 1978.
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Kay, R. F. “Molar structure and diet in extant Cercopithecoidea.” In Development, Function and Evolution of Teeth, edited by P. M. Butler and K. Joysey, 309–39. London: Academic Press, 1978.
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Kay, R. F., and W. L. Hylander. “The dental structure of mammalian folivores wiht special reference to primates and Phalangeroidea (Marsupialia).” In The Ecology of Arboreal Folivores, edited by G. G. Montgomery, 173–91. Washington, D. C.: Smithsonian Institution Press, 1978.
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Kay, R. F., and K. M. Hiiemae. “Mastication in Galago crassicaudatus, a cinefluorographic and occlusal study.” In Prosimian Biology, edited by R. D. Martin, G. A. Doyle, and A. C. Walker, 501–30. London: Duckworth, 1974.
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Hiiemae, K. M., and R. F. Kay. “Evolutionary trends in the dynamics of primate mastication.” In Symp. Fourth Int. Cong. Primatology, Vol 3: Craniofacial Biology of Primates, edited by M. R. Zingeser, 28–64. Basel: Karger, 1973.
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Hiiemae, K. M., and R. F. Kay. “Evolutionary trends in the dynamics of primate mastication.,” 3:28–64, 1973.
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Other Articles
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Vizcaíno, S. F., R. F. Kay, and M. S. Bargo. “Early Miocene Paleobiology in Patagonia: High-latitude paleocommunities of the Santa Cruz Formation.” Cambridge, UK: Cambridge University Press, 2012.
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Simons, Elwyn L., Friderun Ankel-Simons, Prithijit S. Chatrath, Richard S. Kay, Blythe Williams, John G. Fleagle, Daniel L. Gebo, et al. “Outrage at high price paid for a fossil.” Nature, July 2009. https://doi.org/10.1038/460456a.Full Text
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Kirk, E Christopher, Matt Cartmill, Richard F. Kay, and Pierre Lemelin. “Comment on "Grasping primate origins".” Science (New York, N.Y.), May 2003. https://doi.org/10.1126/science.1082060.Full Text
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Book Reviews
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Kay, R. F. “Much hype and many errors.” Science, 2009.
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Kay, Richard F. “The primate fossil record.” American Journal of Human Biology. Wiley, November 2003. https://doi.org/10.1002/ajhb.10209.Full Text
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Kay, R. F. “Colobine monkeys. Their ecology, behavior and evolution - Davies,AG, Gates,JF.” Science. AMER ASSOC ADVANCEMENT SCIENCE, January 12, 1996.Link to Item
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Kay, R. F. “Review of Sexual Dimorphism in Living and Fossil Primates, edited by M. Pickford and B. Chiarelli.” International Journal of Primatology, 1987.
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Kay, R. F. “Primate Evolution, edited by J.G. Else and P.C. Lee.” Quarterly Review of Biology, 1987.
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Kay, Richard F. “: Analysis of Species-Specific Molar Adaptations in Strepsirhine Primates . Daniel Seligsohn.” American Anthropologist. Wiley, December 1979. https://doi.org/10.1525/aa.1979.81.4.02a00730.Full Text
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Conference Papers
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Morse, Paul E., James D. Pampush, and Richard F. Kay. “Molar sharpness maintained with wear in the early anthropoids Apidium and Aegyptopithecus.” In American Journal of Biological Anthropology, 177:128–128, 2022.Link to Item
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Morse, Paul E., Michala K. Stock, Richard F. Kay, and Blythe A. Williams. “Shearing ratios of Aycross anaptomorphine omomyids: Support for a middle Eocene refugium habitat.” In American Journal of Physical Anthropology, 174:74–74, 2021.Link to Item
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Pampush, James D., Paul E. Morse, Edward J. Fuselier, and Richard F. Kay. “Ratios of Dental Surface Concavity and Convexity: Implications for Dental Topography Analyses.” In American Journal of Physical Anthropology, 174:81–81, 2021.Link to Item
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Kay, Richard F., Jonathan M. G. Perry, Sergio F. Vizcaano, and M Susana Bargo. “A skeleton of HomunculuspatagonicusAmeghino, 1891 from the Santa Cruz Formation (Early Miocene, Patagonia).” In American Journal of Physical Anthropology, 171:138–138. WILEY, 2020.Link to Item
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Lundeen, Ingrid K., and Richard F. Kay. “Olfactory system anatomy in Homunculus and the ecological importance of olfactory cues among stem platyrrhines.” In American Journal of Physical Anthropology, 168:148–49. WILEY, 2019.Link to Item
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Morse, Paul E., James D. Pampush, and Richard F. Kay. “Junk DNE: How Surface Simplification and Scanning Resolution Affect Measures of Dental Crown Sharpness.” In American Journal of Physical Anthropology, 168:169–169. WILEY, 2019.Link to Item
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Gonzales, Lauren A., Richard F. Kay, Wout Salenbien, Luis Angel Valdivia, Gustavo Bejar, Laura Chornogubsky, Jean-Noel Martinez, Catherine A. Rigsby, and Paul A. Baker. “New Early Miocene primate bearing faunal assemblage from the Alto Madre de Dios, Peru.” In American Journal of Physical Anthropology, 165:101–2. WILEY, 2018.Link to Item
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Pampush, James D., Paul E. Morse, Stephen G. B. Chester, Jackson P. Spradley, Blythe A. Williams, Kenneth E. Glander, Mark F. Teaford, and Richard F. Kay. “Dental Topography and Food Processing in Wild-Caught Costa Rican Alouatta.” In American Journal of Physical Anthropology, 165:198–198. WILEY, 2018.Link to Item
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Kay, Richard F., and Blythe A. Williams. “Are there any African Platyrrhines?” In American Journal of Physical Anthropology, 162:239–40. WILEY, 2017.Link to Item
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Pampush, James D., Jackson P. Spradley, Justin T. Gladman, Darbi Griffith, Lauren A. Gonzales, and Richard F. Kay. “Platyrrhine dynamic dental topography: implications for secondary dental morphology in brachydont, long-lived taxa.” In American Journal of Physical Anthropology, 162:308–9. WILEY, 2017.Link to Item
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Gonzales, Lauren A., Michael D. Malinzak, and Richard F. Kay. “The influence of brain size on canal radius of curvature.” In American Journal of Physical Anthropology, 159:157–58. WILEY-BLACKWELL, 2016.Link to Item
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Pampush, James D., Arianna R. Harrington, Jackson P. Spradley, Alexander Q. Vining, Kari L. Allen, and Richard F. Kay. “Quantitative Occlusal Surface Complexity Metrics and Dental Wear in Alouatta palliata.” In American Journal of Physical Anthropology, 159:247–247. WILEY-BLACKWELL, 2016.Link to Item
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Spradley, Jackson P., James D. Pampush, and Richard F. Kay. “Environmental Variation Explains Mammalian Niche Structure in Central and South America.” In American Journal of Physical Anthropology, 159:299–299. WILEY-BLACKWELL, 2016.Link to Item
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Gonzales, Lauren A., Michael D. Malinzak, and Richard F. Kay. “Intraspecific Semicircular Canal Variance-A Missing Element in Adaptive Scenarios?” In American Journal of Physical Anthropology, 156:149–50. WILEY-BLACKWELL, 2015.Link to Item
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Spradley, Jackson P., Blythe A. Williams, and Richard F. Kay. “Environmental Variables Affecting Primate Species Richness in the Neotropics.” In American Journal of Physical Anthropology, 156:294–294. WILEY-BLACKWELL, 2015.Link to Item
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Spradley, Jackson P., Ken E. Glander, and Rich F. Kay. “Environmental stress and molar wear in three populations of mantled howling monkeys (Alouatta palliata).” In American Journal of Physical Anthropology, 153:244–244. WILEY-BLACKWELL, 2014.Link to Item
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Winchester, Julia M., Doug M. Boyer, Elizabeth M. St Clair, Ashley D. Gosselin-Ildari, Siobhán B. Cooke, and Justin A. Ledogar. “Dental topography of platyrrhines and prosimians: convergence and contrasts.” In American Journal of Physical Anthropology, 153:29–44, 2014. https://doi.org/10.1002/ajpa.22398.Full Text
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Fernicola, J. C., S. F. Vizcaíno, M. S. Bargo, R. F. Kay, J. I. Cuitiño, N. Toledo, N. A. Muñoz, et al. “Localidades fosilíferas de la Formación Santa Cruz (Mioceno Inferior) en el margen meridional del valle del río Santa Cruz, provincia de Santa Cruz, Argentina.” In X Congreso Argentino De Paleontología Y Bioestratigrafía Y Vii Congreso Latinoamericano De Paleontología, Actas:164, 2013.
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Gonzales, Lauren A., Michael D. Malinzak, and Richard F. Kay. “Semicircular canal morphology as a predictor of platyrrhine locomotor behavior.” In American Journal of Physical Anthropology, 150:133–133. WILEY-BLACKWELL, 2013.Link to Item
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Ludeman, Elissa M., E Christopher Kirk, Ashley D. Gosselin-Ildari, Autumn Blaylock, Richard F. Kay, and Marc Godinot. “Cochlear labyrinth volume and predicted hearing abilities in Adapis, Necrolemur, Homunculus, and Tremacebus.” In American Journal of Physical Anthropology, 150:183–84. WILEY-BLACKWELL, 2013.Link to Item
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Allen, Kari L., Richard F. Kay, Kevin D. Hunt, Charles D. Beeker, Geoffrey W. Conrad, and Jessica Keller. “Brain size and endocranial morphology of Antillothrix (Holocene, Dominican Republic, Hispaniola).” In American Journal of Physical Anthropology, 147:82–82. WILEY-BLACKWELL, 2012.Link to Item
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Allen, Kari L., and Richard F. Kay. “ENDOCAST SHAPE AND BRAIN PROPORTIONS IN PRIMATES.” In Journal of Vertebrate Paleontology, 32:55–55. TAYLOR & FRANCIS INC, 2012.Link to Item
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Cooke, Siobhan B., and Richard F. Kay. “Dental morphology and dietary adaptation in Homunculus patagonicus.” In American Journal of Physical Anthropology, 147:119–20. WILEY-BLACKWELL, 2012.Link to Item
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Hunt, Kevin D., and Richard F. Kay. “ORIGIN OF THE GREATER ANTILLEAN PRIMATE FAUNA.” In Journal of Vertebrate Paleontology, 32:114–114. TAYLOR & FRANCIS INC, 2012.Link to Item
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Kay, Richard F., Sergio F. Vizcaino, and M. S. Bargo. “THE PALEOENVIRONMENT AND PALEOECOLOGY OF THE COASTAL MIOCENE SANTA CRUZ FORMATION (LATE EARLY MIOCENE, ARGENTINA).” In Journal of Vertebrate Paleontology, 32:119–119. TAYLOR & FRANCIS INC, 2012.Link to Item
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Malinzak, Michael, Richard F. Kay, and Timothy E. Hullar. “Semicircular canal orthogonality, not radius, best predicts mean speed of locomotor head rotation: a new hypothesis with implications for reconstructing behaviors in extinct species.” In American Journal of Physical Anthropology, 144:204–204. WILEY-BLACKWELL, 2011.Link to Item
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Kay, R. F., and K. L. Allen. “Dietary quality and brain size in platyrrhines: support for the "Expensive Tissue Hypothesis".” In American Journal of Physical Anthropology, 163–163. WILEY-LISS, 2009.Link to Item
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Kay, R. F., and E. C. Kirk. “New data on encephalization in Miocene New World monkeys: implications for anthropoid brain evolution.” In Journal of Vertebrate Paleontology, 28:151A, 2008.
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Krueger, K. L., J. R. Scott, P. S. Ungar, and R. F. Kay. “Comparisons of dental microwear texture attributes between facets in three primate taxa.” In American Journal of Physical Anthropology, 135–135. WILEY-LISS, 2008.Link to Item
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Malinzak, M., R. F. Kay, E. L. Sims, and R. Queen. “Characterization of primate head accelerations during locomotion: A novel application of 3D motion analysis with comparative implications.” In American Journal of Physical Anthropology, 147–48. WILEY-LISS, 2008.Link to Item
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Perry, J. M. G., R. F. Kay, S. F. Vizcaino, and M. S. Bargo. “First Cranial Material of a Juvenile Monkey from the Tertiary of South America: Cranial Anatomy and Dental Eruption Sequence.” In Journal of Vertebrate Paleontology, 28:127A, 2008.
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Teaford, M. F., F. E. Grine, R. F. Kay, B. W. Schubert, and P. S. Ungar. “Low magnification dental microwear: The problem of postmortem artifacts.” In Journal of Vertebrate Paleontology, 28:151A, 2008.
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Kay, R. F., E. C. Kirk, M. Malinzak, and M. W. Colbert. “Brain size, activity pattern, and visual acuity in Homunculus patagonicus, an early Miocene stem platyrrhine: the mosaic evolution of brain size and visual acuity in Anthropoidea.” In Journal of Vertebrate Paleontology, 26:83A-84A, 2006.
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Kay, R. F., T. C. Rae, T. Koppe, and M. W. Colbert. “Paranasal pneumatization in the early Miocene platyrrhine Homunculus patagonicus.” In American Journal of Physical Anthropology, 112–112. WILEY-LISS, 2006.Link to Item
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Kay, R. F., and M. Takai. “Pitheciidae and other platyrrhine seed predators: the dual occupation of the seed predator niche during platyrrhine evolution.,” 511. Entebe Uganda: International Journal of Primatology, 2006.
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Mitchell, T. R. T., D. Schmitt, and R. F. Kay. “The role of binocular vision in primate locomotion.” In American Journal of Physical Anthropology, 132–33. WILEY-LISS, 2006.Link to Item
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Perry, J. M. G., R. F. Kay, and M. W. Colbert. “Tooth root size and chewing muscle leverage in Homunculus, a Miocene Primate from Patagonia.” In Journal of Vertebrate Paleontology, 26:110A, 2006.
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Vizcaíno, S. F., M. S. Bargo, and R. F. Kay. “Reconstructing the paleoecology of the Santacrucian fauna (Early-Middle Miocene; Patagonia; Argentina) From form and function. Armadillo and primate examples.” In Journal of Vertebrate Paleontology, 26:135A, 2006.
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Vizcaíno, S. F., M. S. Bargo, and R. F. Kay. “Morfología y paleobiología de vertebrados. Aplicación a los mamíferos de la Formación Santa Cruz (Mioceno temprano-medio), Patagonia, Argentina.” In Ix Congreso Argentino De Paleontología Y Bioestratigrafía, 18 22 De Septiembre, Córdoba, Argentina, 144, 2006.
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Teaford, Mark F. “Back to the future.” In Evolutionary Anthropology: Issues, News, and Reviews, 13:198–99. Wiley, 2004. https://doi.org/10.1002/evan.20016.Full Text
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Kay, R. F., J. B. Rossie, M. W. Colbert, and T. B. Rowe. “Observations on the olfactory system of Tremacebus harringtoni (Platyrrhini, early Miocene, Sacanana, Argentina) based on high resolution X-ray CT scans.” In American Journal of Physical Anthropology, 123–24. WILEY-BLACKWELL, 2004.Link to Item
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Madden, R., A. Carlini, G. Vucetich, R. Kay, M. Heizler, F. Vilas, G. Re, M. J. Kohn, A. Zucol, and E. S. Bellosi. “The terrestrial Eocene-Oligocene transition at Gran Barranca in Patagonia,” P-38, 2004.
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Madden, R., A. Carlini, M. G. Vucetich, R. Kay, M. Heizler, F. Vilas, G. Re, M. J. Kohn, A. Zucol, and E. S. Bellosi. “Gran Barranca: the most complete South American middle Cenozoic sequence.,” Abstracts and Program Book:P-39, 2004.
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Mitchell, T. R. T., R. F. Kay, M. W. Colbert, and T. B. Rowe. “The interorbital region of Dolichocebus gaimanensis (Platyrrhini, early Miocene, Argentina) based on high resolution X-ray CT imaging-phylogenetic implications.” In American Journal of Physical Anthropology, 148–148. WILEY-BLACKWELL, 2004.Link to Item
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Mitchell, T. R. T., R. F. Kay, M. W. Colbert, and T. R. Rowe. “The interorbital region of Dolichocebus gaimanensis (Platyrrhini, early Miocene, Argentina) based on high resolution X-ray CT imaging—phylogenetic implications.” In American Journal of Physical Anthropology, Supplement 35:124, 2004.
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Vizcaino, S. F., M. S. Bargo, A. A. Tauber, and R. F. Kay. “Myrmecophagidae (Mammalia, Xenarthra) de edad Santacrucense (Mioceno temprano-medio).” In Ameghiniana, 2004.
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Vucetich, G., A. Carlini, R. Madden, C. N. Kay, and E. C. Vieytes. “Nuevos hallazgos entre los más antiguos roedores de América del Sur: una dispersion post-transición Eoceno-Oligoceno.” In Resumenes De Comunicaciones De La Asociación Argentina De Paleontologia (Diamante, Argentina), 2004:29, 2004.
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Vucetich, G., A. Carlini, R. Madden, and R. F. Kay. “New Discoveries among the Oldest Rodents in South America: How Old and How Primitive?” In Journal of Vertebrate Paleontology, 24:125A, 2004.
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Kay, R. F., and T. R. T. Mitchell. “Cranial evidence for the timing of the platyrrhine-catarrhine divergence.” In American Journal of Physical Anthropology, 127–127. WILEY-LISS, 2003.Link to Item
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Madden, R., A. Carlini, G. Vucetich, R. Kay, M. Heizler, F. Vilas, G. Re, M. J. Kohn, A. Zucol, and E. S. Bellosi. “The terrestrial Eocene-Oligocene transition at Gran Barranca in Patagonia,” P-38, 2003.
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Madden, R., A. Carlini, M. G. Vucetich, R. Kay, M. Heizler, F. Vilas, G. Re, M. J. Kohn, A. Zucol, and E. S. Bellosi. “Gran Barranca: the most complete South American middle Cenozoic sequence.,” Abstracts and Program Book:P-39, 2003.
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Heizler, M., R. F. Kay, R. H. Madden, M. M. Mazzzoni, G. Re, H. Sandeman, and M. G. Vucetich. “Geochronologic age of the casamayoran fauna at Gran Barranca, Chubut Province, Argentina.” In Congreso Argentino De Paleontologia Y Biostratigrafia, VII:89, 1998.
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Kay, R. F., and M. R. Sanchez-Villagra. “Skull of Hondalagus, an argyrolagid marsupial from the Middle Miocene of Bolivia.” In Journal of Vertebrate Paleontology, 1997.
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Kay, R. F., R. H. Madden, and M. M. Mazzoni. “Calibraciones de edades mamifero en la Gran Barranca del Lago Colhue Huapi, Provincia del Chubut, Argentina.” In Simposio “Paleogeno De América Del Sur". B. Aires, 1 Octubre de 1996:14, 1996.
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Kay, R. F., and D. D. Johnson. “New platyrrhines from the middle Miocene of Argentina.” In American Journal of Physical Anthropology, Suppl. 22:136–37, 1996.
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Ungar, P. S., R. F. Kay, M. F. Teaford, and A. Walker. “Dental evidence for diets of Miocene apes.” In American Journal of Physical Anthropology, Suppl. 22:232–33, 1996.
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Kay, R. F., and B. A. Williams. “Recent finds of monkeys from the Oligocene/Miocene of Salla, Bolivia.” In American Journal of Physical Anthropology, Suppl. 20:124, 1995.
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Madden, R. H., J. Guerrero, R. F. Kay, J. J. Flynn, C. C. Swisher/III, and A. H. Walton. “The Laventan Stage and Laventan Age; New Chronostratigraphic and geochronologic units for the Miocene of South America,” Vol. April 3-8, 1994. Trelew, Chubut, Argentina, 1994.
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Meldrum, D. J., R. F. Kay, and C. H. Chiu. “Phylogenetic relationships of Cebus and Saimiri inferred from mitochondrial DNA sequences and dental anatomy.” In American Journal of Physical Anthropology, Suppl. 16:144–45, 1993.
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Madden, R. H., and R. F. Kay. “Aportes al conocimiento de la fauna de mamiferos del Grupo Honda, Mioceno, Colombia.” In Ix Jornadas Argeninas De Paleontologia De Vertebrados, Trelew, Chubut, 12al15deMayo, 1992.
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Williams, B. A., and R. F. Kay. “Phylogenetic analysis of Eocene primates suggests Omomyidae is not a monophyletic group,” 286. Strasbourg, France, 1992.
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Ford, S. M., L. C. Davis, and R. F. Kay. “New platyrrhine astragalus from the Miocene of Colombia.” In American Journal of Physical Anthropology, Supplement 12:73–74, 1991.
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Kay, R. F., and M. R. L. Anthony. “Dietary evolution in platyrrhine primates and the comparative method.” In Journal of Vertebrate Paleontology, 11:39, 1991.
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KAY, R. F. “A POSSIBLE GIANT TAMARIN FROM THE MIOCENE OF COLOMBIA.” In American Journal of Physical Anthropology, 81:248–248. WILEY-LISS, 1990.Link to Item
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MADDEN, R. H., and R. F. KAY. “NEW STIRTONIA-VICTORIAE MATERIAL FROM THE MIOCENE OF COLOMBIA.” In International Journal of Primatology, 8:473–473. PLENUM PUBL CORP, 1987.Link to Item
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KAY, R. F., and H. H. COVERT. “SPECIES NUMBER DETERMINATION AND SPECIMEN ALLOCATION IN FOSSIL SAMPLES.” In American Journal of Physical Anthropology, 57:201–201. WILEY-LISS, 1982.Link to Item
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KAY, R. F. “THE ADAPTIVE SIGNIFICANCE OF ENAMEL THICKNESS WITH IMPLICATIONS FOR HOMINID ORIGINS.” In American Journal of Physical Anthropology, 52:243–243. WILEY-LISS, 1980.Link to Item
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SIMONS, E. L., R. F. KAY, and J. G. FLEAGLE. “RECENTLY RECOVERED OLIGOCENE APES FROM EGYPT.” In American Journal of Physical Anthropology, 52:279–279. WILEY-LISS, 1980.Link to Item
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KAY, R. F., and W. S. SHEINE. “MODEL FOR COMPARISON OF MASTICATORY EFFICIENCY IN PRIMATES.” In American Journal of Physical Anthropology, 48:410–11. WILEY-LISS, 1978.Link to Item
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KAY, R. F. “POST-OLIGOCENE EVOLUTION OF CATARRHINE DIETS.” In American Journal of Physical Anthropology, 47:141–42. WILEY-LISS, 1977.Link to Item
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Cartmill, M., and R. F. Kay. “Craniodental morphology and development and the problem of tarsier affinities,” Abstract volume:93. Cambridge, England, 1976.
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Hiemae, K., and R. F. Kay. “Trends in the evolution of primate mastication.” In Nature, 240:486–87, 1972. https://doi.org/10.1038/240486a0.Full Text
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Kay, Richard F., Elwyn Simons, and Jennifer L. Ross. “The Basicranial Anatomy of African Eocene/Oligocene Anthropoids. Are There Any Clues for Platyrrhine Origins?,” 125–58. Springer New York, n.d. https://doi.org/10.1007/978-0-387-73896-3_11.Full Text
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Theses and Dissertations
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Kay, R. F. “Mastication, molar tooth structure and diet in primates. Ph. P. dissertation,” 1973.
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- Teaching & Mentoring
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Recent Courses
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Advising & Mentoring
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I advise 6 undergraduate majors at the moment but the number will increase as new majors declare. Last year it was 13.
I was principal advisor of two graduate students in the Department-- Lauren Gonzales defended her thesis in September, 2015, Jackson Spradley is making excellent progress. I serve on the committees of four other graduate students (3 in the department and one in the Nicholas School). I also am on the graduate committee for one student at Boise State University.
Available to mentor:
- PhD
- Undergraduate
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I advise 6 undergraduate majors at the moment but the number will increase as new majors declare. Last year it was 13.
- Scholarly, Clinical, & Service Activities
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Presentations & Appearances
- Ecomorphology as a Key to understanding Paleoclimates: The case of the Santa Cruz Formation (Early Miocene, Patagonia). Conferencia. Facultidad de Ciencias Naturales y Museo, Universidad Nacional de La Plata. April 27, 2016 2016
- A case study in primate biogeography: the Neotropics— the roots of our current understanding.. Universidad Nacional de Piura. January 29, 2016 2016
- Using faunal richness and ecomorphology to reconstruct climate change. November 23, 2013 2013
- Reconstructing Paleoecology of Miocene Mammals in Patagonia. November 16, 2011 2011
- Reconstructing Paleoecology of Miocene Mammals in Patagonia. November 10, 2011 2011
- The origin of anthropoid primates and platyrrhine evolution in South America. May 5, 2009 2009
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Service to the Profession
- Molecular Phylogenetics and Evolution. 2013 - 2014 2013 - 2014
- Internatoional Journal of Primatology. November 30, 2010 2010
- Proceedings, Royal Society B. November 30, 2010 2010
- Member, HOMINID Grant panel : NSF Physical Anthropology. 2009 - 2015 2009 - 2015
- Associate Editor : Ameghiniana (Argentine Paleontological Association). 2000 - 2014 2000 - 2014
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