RODENTS FROM THE LATE HEMPHILLIAN (LATEST MIOCENE), SIOUX COUNTY, NEBRASKA

摘要

Only one rodent specimen has been previously described from the late Hemphillian ZX Bar local fauna from Sioux County, Nebraska-the holotype of the heteromyid Perognathus coquorum Wood. Are-examination of this specimen has led to its allocation to the dipodomyine heteromyid genus Prodipodomys Hibbard. An additional specimen of a fossil rodent has been recognized from the ZX Bar fauna that is referable to a new species of the primitive geomyid Pliogeomys, P. russelli.