Molecular evidence for deep Precambrian divergences among metazoan phyla
Publication
, Journal Article
Wray, GA; Levinton, JS; Shapiro, LH
Published in: Science
January 1, 1996
A literal reading of the fossil record suggests that the animal phyla diverged in an 'explosion' near the beginning of the Cambrian period. Calibrated rates of molecular sequence divergence were used to test this hypothesis. Seven independent data sets suggest that invertebrates diverged from chordates about a billion years ago, about twice as long ago as the Cambrian. Protostomes apparently diverged from chordates well before echinoderms, which suggests a prolonged radiation of animal phyla. These conclusions apply specifically to divergence times among phyla; the morphological features that characterize modern animal body plans, such as skeletons and coelams, may have evolved later.
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Published In
Science
DOI
ISSN
0036-8075
Publication Date
January 1, 1996
Volume
274
Issue
5287
Start / End Page
568 / 581
Related Subject Headings
- General Science & Technology
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Wray, G. A., Levinton, J. S., & Shapiro, L. H. (1996). Molecular evidence for deep Precambrian divergences among metazoan phyla. Science, 274(5287), 568–581. https://doi.org/10.1126/science.274.5287.568
Wray, G. A., J. S. Levinton, and L. H. Shapiro. “Molecular evidence for deep Precambrian divergences among metazoan phyla.” Science 274, no. 5287 (January 1, 1996): 568–81. https://doi.org/10.1126/science.274.5287.568.
Wray GA, Levinton JS, Shapiro LH. Molecular evidence for deep Precambrian divergences among metazoan phyla. Science. 1996 Jan 1;274(5287):568–81.
Wray, G. A., et al. “Molecular evidence for deep Precambrian divergences among metazoan phyla.” Science, vol. 274, no. 5287, Jan. 1996, pp. 568–81. Scopus, doi:10.1126/science.274.5287.568.
Wray GA, Levinton JS, Shapiro LH. Molecular evidence for deep Precambrian divergences among metazoan phyla. Science. 1996 Jan 1;274(5287):568–581.
Published In
Science
DOI
ISSN
0036-8075
Publication Date
January 1, 1996
Volume
274
Issue
5287
Start / End Page
568 / 581
Related Subject Headings
- General Science & Technology