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X-ray CT scan as an aid to identification and description of a new bivalve species (Mollusca) from the Mississippian Bluefield Formation, Southeastern West Virginia

Published online by Cambridge University Press:  14 July 2015

Robert L. Peck
Affiliation:
HC 74 Box 98-G, Hinton, West Virginia 25951-9115,
Jack B. Bailey
Affiliation:
Department of Geology, Western Illinois University, 1 University Circle, Macomb, Illinois 61455,
Richard J. Heck
Affiliation:
Department of Land Resource Science, Ontario Agriculture College, University of Guelph, Guelph, Ontario, Canada N1G 2W1,
Nathan T. Scaiff
Affiliation:
Ontario Agriculture College, University of Guelph, Guelph, Ontario, Canada N1G 2W1,

Abstract

X-ray CT scans at two different energies of three articulated specimens of Spathelopsis oakvalensis n. sp., a bivalve from the Bluefield Formation of the Mauch Chunk Group (Mississippian, Chesterian) from southeastern West Virginia, permitted observation and description of poorly known internal features of the shell, resulting in a reversal of the shell orientation alleged by past authors and concomitant reassignment of this problematic genus to the palaeotaxodont family Nuculanidae Adams and Adams. Distinctive posterior and anterior gapes in Spathelopsis suggest separation of inhalant and exhalant water streams, a characteristic associated with derived but not primitive palaeotaxodonts.

Type
Research Article
Copyright
Copyright © The Paleontological Society 

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