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Pipestoneomyidae, a new family of fossil rodents (Mammalia) from the Duchesnean (late middle Eocene, Bartonian) to Orellan (early Oligocene, Priabonian) of North America

Published online by Cambridge University Press:  20 May 2016

William W. Korth
Affiliation:
Rochester Institute of Vertebrate Paleontology, 265 Carling Road, Rochester, New York 14610,
Robert J. Emry
Affiliation:
Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, P.O. Box 37012, Washington, DC 20013,

Abstract

Additional specimens of the problematical rodent Pipestoneomys Donahoe, 1956, have allowed for recognition of a new family, Pipestoneomyidae. A new genus and species of pipestoneomyid is recognized from the late middle Eocene (Duchesnean North American Land Mammal Age; Bartonian), Argorheomys septendrionalis, which is morphologically more primitive than Pipestoneomys and demonstrates that this new family has been distinct since the Duchesnean. The Pipestoneomyidae share a number of derived characters with the Geomorpha, especially the two-part inner layer of incisor enamel of the Eoymidae. The Pipestoneomyidae differ from the Eomyidae in lacking the basic “omega” pattern of the cheek teeth of the former, so are in the Eomyoidea as a distinct family.

Type
Research Article
Copyright
Copyright © The Paleontological Society 

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