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New rodents (Mammalia) from the late Barstovian (Miocene) Valentine Formation, Nebraska

  • William W. Korth (a1)

Abstract

Additional fossil material from the Valentine Formation in Knox and Brown Counties, Nebraska, has allowed for the recognition of three new species of rodents, a heteromyid (Perognathus brevidens), a geomyid (Parapliosaccomys annae), and a zapodid (Schaubeumys cartomylos). The specimens referred here to P. brevidens were previously identified as P. furlongi, those of S. cartomylos were identified as S. grangeri, and those of P. annae were previously recognized as Lignimus cf. L. hibbardi. It is evident that Lignimus Storer should be restricted to the type species L. montis, and the remainder of the species referred to this genus are referred to Parapliosaccomys Shotwell. Parapliosaccomys is recognized as the earliest member of the subfamily Geomyinae based on its dental morphology, which extends the range of this subfamily into the Barstovian. The fauna from Annie's Geese Cross Quarry (Knox County) is recognized as being late Barstovian based on comparison with the older Norden Bridge Quarry (Brown County).

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New rodents (Mammalia) from the late Barstovian (Miocene) Valentine Formation, Nebraska

  • William W. Korth (a1)

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