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Science 11 June 1993:
Vol. 260. no. 5114, pp. 1626 - 1629
DOI: 10.1126/science.260.5114.1626
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Articles

Diversity of Atlantic Coastal Plain Mollusks Since the Pliocene

Warren D. Allmon 1, Gary Rosenberg 2, Roger W. Portell 3, and Kevin S. Schindler 3

1 Paleontological Research Institution, Ithaca, NY 14850
2 Malacology Department, Academy of Natural Sciences of Philadelphia, Philadelphia, PA 19103
3 Florida Museum of Natural History, University of Florida, Gainesville, FL 32611

About 70 percent of tropical western Atlantic mollusk species have become extinct since the Pliocene, which has led to perceptions of a corresponding decline in diversity. However, a compilation of gastropod species from Plio-Pleistocene faunas of the United States Atlantic coastal plain and from Recent western Atlantic faunas indicates that regional diversity has not changed since the Pliocene. Gastropod diversity in the Pliocene Pinecrest Beds in Florida approximates that seen today on either coast of Florida. Gastropod diversity is not demonstrably different in the Recent tropical western Atlantic than in the Recent tropical eastern Pacific. High extinction rates must have been balanced by high origination rates.

Submitted on January 19, 1993
Accepted on April 23, 1993


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