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Endemism and extinction of a new genus of Chionine (Veneridae: Chioninae) bivalve from the Late Neogene of Venezuela

Published online by Cambridge University Press:  14 July 2015

Peter D. Roopnarine
Peter D. Roopnarine*
Affiliation:
Department of Biology, Southeast Missouri State University, Cape Girardeau, Missouri 63701
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Abstract

Liromissus, a new genus of chionine bivalve from the Neogene of Venezuela, serves as an example of the link between geographic range, endemism and extinction susceptibility. Unlike other Neogene tropical American chionine genera, Liromissus was not widespread in the tropical Western Atlantic and Eastern Pacific, but was instead restricted to the Atlantic Gatunian region. Late Neogene extinctions in tropical America affected taxa with restricted geographic ranges, and regions with higher degrees of endemism more severely. Accordingly, Liromissus is the only tropical chionine genus to suffer extinction during the Neogene.

The type species of Liromissus, L. quirosensis, was originally described as a member of the genus Lirophora. Morphological considerations preclude this assignment, but also demonstrate that Liromissus possesses all the characters diagnostic of the Chioninae.

Type
Research Article
Information
Journal of Paleontology , Volume 71 , Issue 6 , November 1997 , pp. 1039 - 1046
Copyright
Copyright © The Paleontological Society 

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