Large fossil platyrrhines from the Rio Acre local fauna, late Miocene, western Amazonia

In September, 1977 and July, 1979, fossil vertebrates were collected at several localities along the Rio Acre west of Inapari, Peru on the border between Brazil and the Departamento de Madre de Dios, Peru, and also between Brazil and Departamento de Pando, Bolivia (approximate coordinates, 10°50′S, 69°50′W). The fauna from these localities is assigned to the late Miocene Huayquerian Land Mammal Age (ca. 9-6 Ma). On a synopsis of the mammalian remains from these localities, Frailey (1986) mentions one specimen, LACM 117501, a right lower molar, as a possible marsupial, of indeterminate family. Further comparisons now demonstrate that this specimen should be provisionally assigned to the Colombian monkey genus Stirtonia from the middle Miocene La Venta fauna. Another very large primate tooth discovered at a different locality, probably a cebine, is here described for the first time. These are the first recorded occurrences of platyrrhine primates between approximately 12 and 1 million years ago. -from Authors

Duke Scholars

Author Richard Frederick Kay Evolutionary Anthropology