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Paramys compressidens Peterson and the systematic relationships of the species of Paramys (Paramyinae, Ischyromyidae)

Published online by Cambridge University Press:  02 September 2016

William W. Korth
William W. Korth*
Affiliation:
University of Nebraska State Museum, Lincoln 68588
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Abstract

Paramys compressidens Peterson, from the Uintan of Utah, has long been considered a member of the genus Ischyrotomus Matthew. A re-examination of the type and referred specimens of this species demonstrates that it does indeed belong in the genus Paramys and that several of the previously cited referred specimens can be allocated to other known species.

Systematic relationships between the species of Paramys are analyzed. Recognizable morphoclines within this genus are increase in size and amount of crenulation of the enamel on the cheek teeth, and changes in the cross-sectional shape of the lower incisor. Several species previously considered as belonging to Paramys (P. simpsoni Korth, P. savagei Michaux, P. pourcyensis Michaux, P. ageiensis Michaux) may be referable elsewhere.

Thisbemys Wood, Leptotomus Matthew, and Tapomys Wilson can be directly derived from the known species of Paramys. The origin of several other genera may possibly be found within Paramys, but no ancestral morphotype is currently known.

Type
Research Article
Information
Journal of Paleontology , Volume 62 , Issue 3 , May 1988 , pp. 468 - 471
Copyright
Copyright © The Paleontological Society 

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