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Northeast Pacific Cretaceous record of Pyropsis (Neogastropoda: Pyropsidae) and paleobiogeography of the genus

Published online by Cambridge University Press:  14 July 2015

Richard L. Squires
Richard L. Squires*
Affiliation:
Department of Geological Sciences, California State University, Northridge, California 91330-8266, USA; and Research Associate, Invertebrate Paleontology Section, Natural History Museum of Los Angeles County, Los Angeles, California 90007, USA,
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Abstract

The neogastropod genus Pyropsis Conrad, 1860 (family Pyropsidae Stephenson, 1941) is recognized for the first time from Upper Cretaceous shallow-marine siliciclastic rocks in the region extending from Vancouver Island, British Columbia southward to southern California. Four new species were detected: Pyropsis aldersoni (earliest Coniacian, southern California), Pyropsis californica (early Coniacian, northern California), Pyropsis louellae (late Coniacian or early Santonian, northern California), and Pyropsis grahami (late early Campanian, Vancouver Island).

A critical review of the global reports of Pyropsis, a genus that has been commonly confused with other genera (especially Tudicla Röding, 1798), establishes that Pyropsis had an amphitropical distribution and lived in warm-temperate waters adjacent to a broad tropical realm. It is rare to uncommon wherever found, and its geologic range is middle Cenomanian to an age near the Cretaceous/Paleogene boundary (probably earliest Paleocene). It was moderately widespread before the Maastrichtian but was predominantly restricted to the New World during the Maastrichtian.

Type
Research Article
Information
Journal of Paleontology , Volume 85 , Issue 6 , November 2011 , pp. 1199 - 1215
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Copyright © The Paleontological Society 

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