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Life association of shell and operculum of Ceratopea Ulrich, 1911 (Ordovician; Gastropoda)

Published online by Cambridge University Press:  20 May 2016

David M. Rohr ,
Michael F. Fix  and
Guy Darrough
David M. Rohr
Affiliation:
1Department of Earth and Physical Sciences, Sul Ross State University, Alpine, Texas 79832,
Michael F. Fix
Affiliation:
2Department of Physics, University of Missouri—St. Louis, 8001 Natural Bridge Road, St. Louis, Missouri 63121,
Guy Darrough
Affiliation:
32075 Rosedale Court, Arnold, Missouri 63010
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Extract

Ceratopea Ulrich, 1911, from the Lower Ordovician of North America, Greenland, and Scotland, is one of a few gastropod genera that was established on the calcareous operculum and not the shell. The operculum is commonly found disassociated, and for many years the nature of the shell itself was unknown (Yochelson, 1975). Yochelson and Bridge (1957, pl. 38, figs. 8–9) illustrated an artificial association of C. unguis with its presumed shell made years earlier by Ulrich and Bridge (Yochelson, written commun.). However, the basal part of the shell is not present. Only one life association of the shell and operculum has been previously documented (Yochelson and Wise, 1972), and that shell is incompletely preserved.

Type
Paleontological Notes
Information
Journal of Paleontology , Volume 78 , Issue 1 , January 2004 , pp. 218 - 220
Copyright
Copyright © The Paleontological Society 

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