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New species of the bivalve Anomia from lower and middle Turonian parts of the Greenhorn Limestone, central Kansas

Published online by Cambridge University Press:  20 May 2016

Walter A. Hasenmueller  and
Donald E. Hattin
Walter A. Hasenmueller
Affiliation:
Indiana Geological Survey, 611 N. Walnut Grove, Bloomington 47405
Donald E. Hattin
Affiliation:
Geology Department, Indiana University, Bloomington 47405
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Abstract

Anomiid bivalves are abundant locally in a few beds of the Jetmore and Pfeifer Members (Turonian) of the Greenhorn Limestone of central Kansas. Our collection comprises nearly 500 whole and fragmentary specimens that are assigned to two new species, Anomia cobbani and A. pfeiferensis, based on external morphology and biometry. Occurrence of delicate Anomia valves in just a few beds of the Jetmore and Pfeifer reflects selective preservation that resulted from unusual taphonomic and diagenetic conditions rather than restricted stratigraphic and geographic range. Variations in curvature of the commissure and close association of Greenhorn Anomia with molds of small baculitid cephalopods suggest that these bivalves were epizoic on the baculitids. On the basis of close morphologic similarity, stratigraphic proximity, and geographic occurrence of the two new species, A. pfeiferensis n. sp. is believed to be the direct evolutionary descendant of A. cobbani n. sp.

Type
Research Article
Information
Journal of Paleontology , Volume 64 , Issue 1 , January 1990 , pp. 104 - 110
Copyright
Copyright © The Paleontological Society 

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