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Matthevia (Polyplacophora) invades the Ordovician: The first reported post-Cambrian occurrence

Published online by Cambridge University Press:  20 May 2016

John Pojeta Jr. ,
John F. Taylor  and
Guy Darrough
John Pojeta Jr.
Affiliation:
U.S. Geological Survey and Smithsonian Institution, MRC 137, Museum of Natural History, Smithsonian Institution, Washington, D.C. 20560, USA,
John F. Taylor
Affiliation:
Geoscience Department, Indiana University of Pennsylvania, Indiana, Pennsylvania 15705, USA
Guy Darrough
Affiliation:
2075 Rosedale Court, Arnold, Missouri 63010, USA
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Extract

The polyplacophoran Matthevia Walcott, 1885 has been reported previously only from Cambrian rocks. Recovery of specimens of two different species of Matthevia from the top of the cherty lower Gasconade Dolomite in Missouri extends the known range of the genus into the Ordovician. The presence of the Lower Ordovician trilobite Praepatokephalus Lochman, 1964 in one collection provides the biostratigraphic evidence that the new specimens of Matthevia are Ordovician in age. Matthevia erecta n. sp. is described. An emended diagnosis for the trilobite Praepatokephalus is provided; two species of the genus are briefly described but are left in open nomenclature as P. sp. A and P. sp. B.

Type
Paleontological Notes
Information
Journal of Paleontology , Volume 79 , Issue 5 , September 2005 , pp. 1021 - 1027
Copyright
Copyright © The Paleontological Society 

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