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Popenoeum, a new pseudolivine gastropod genus: widespread and most diversified during the Paleocene

Published online by Cambridge University Press:  19 May 2016

Richard L. Squires ,
William J. Zinsmeister  and
Luis M. Paredes-Mejia
Richard L. Squires
Affiliation:
1Department of Geological Sciences, California State University, Northridge 91330
William J. Zinsmeister
Affiliation:
2Department of Earth and Atmospheric Sciences, Purdue University, West Lafayette, Indiana 47907
Luis M. Paredes-Mejia
Affiliation:
2Department of Earth and Atmospheric Sciences, Purdue University, West Lafayette, Indiana 47907
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Abstract

A new genus, Popenoeum, is proposed for a clade of Upper Cretaceous through lower Eocene pseudolivine gastropods found in North and South America, West Greenland, western Europe, and southern India. Popenoeum n. gen. is characterized by tabulate whorls with a prominent subsutural canal, collabral costae that terminate as tubercles on the body whorl shoulder, and closely spaced fine to strong spiral cords.

The type species, Popenoeum maritimus n. sp., is from the lower Paleocene (Danian) portion of the San Francisquito Formation, southern California, and from the upper Paleocene (Thanetian) Sepultura Formation, Baja California. Popenoeum maritimus bajaensis n. subsp. is also present in the Sepultura Formation.

Other species and subspecies in the clade include Popenoeum sp. (Toulmin) and P. scalina Heilprin from Alabama; P. mutabilis mutabilis (Woods) and P. mutabilis woodsi (Olsson) from northwestern Peru; P. aff. P. maritimus from West Greenland; P. brevis (Doncieux) and P. prima (Defiance) from France; P. chavani (Glibert), P. robusta (Briart and Cornet) and P. briarti (Vincent) from Belgium; and P. subcostata (Stoliczka) from southern India. The earliest species is P. subcostata, and it is the only Cretaceous species. The youngest form is P. mutabilis woodsi, and it is the only Eocene species. The new genus reached its peak during the Paleocene.

Type
Research Article
Information
Journal of Paleontology , Volume 63 , Issue 2 , March 1989 , pp. 212 - 217
Copyright
Copyright © The Paleontological Society 

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