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Ptychopleurites spinosa, a new trilobite species from the Upper Cambrian of Texas and South Dakota

Published online by Cambridge University Press:  14 July 2015

James H. Stitt  and
Wendy L. Metcalf
James H. Stitt
Affiliation:
Department of Geological Sciences, University of Missouri–Columbia, Columbia 65211
Wendy L. Metcalf
Affiliation:
Department of Geological Sciences, University of Missouri–Columbia, Columbia 65211
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Extract

During preparation of a manuscript on new collections of Upper Cambrian trilobites from the Threadgill Creek section in central Texas (Longacre, 1970, text-fig. 6), a new trilobite species Ptychopleurites spinosa was discovered that can be used to recognize a revised base to the Saukia Zone (Trempealeauan Stage) in central Texas. This species is represented in central Texas by numerous, well-preserved cranidia and librigenae, but no pygidia have been recovered. Recently Ptychopleurites spinosa was also identified in a collection of trilobites of the partly correlative Illaenurus Zone (= lower part of Saukia Zone) from the type section of the Deadwood Formation in the Black Hills of South Dakota. This work is part of a paper that will describe the latest Franconian and Trempealeauan trilobites from the Deadwood Formation, using collections made by Dr. Christina Lochman-Balk. Ptychopleurites spinosa is represented in the Black Hills by incompletely preserved cranidia and well-preserved librigenae. Because it is not known which of these two papers will be published first, it was decided to establish Ptychopleurites spinosa as a new species with one of the better Texas cranidia as the holotype and the Black Hills material as part of the suite of paratypes.

Type
Paleontological Notes
Information
Journal of Paleontology , Volume 69 , Issue 6 , November 1995 , pp. 1183 - 1185
Copyright
Copyright © The Paleontological Society 

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