Mammalia - Rodentia - Ischyromyidae

Alternative combination: Ischyrotomus horribilis

Full reference: A. E. Wood. 1962. The Early Tertiary Rodents of the Family Paramyidae. Transactions of the American Philosophical Society 52(1):3-261

Belongs to Pseudotomus according to R. H. Dunn and D. T. Rasmussen 2007

See also Korth 1985 and Wood 1962

Sister taxa: Pseudotomus californicus, Pseudotomus eugenei, Pseudotomus hians, Pseudotomus johanniculi, Pseudotomus littoralis, Pseudotomus petersoni, Pseudotomus robustus, Pseudotomus timmys

Type specimen: Its type locality is Grizzly Buttes, which is in a Bridgerian terrestrial horizon in the Bridger Formation of Wyoming

Distribution: found only at Grizzly Buttes

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Specimen images are retrieved through the ePANDDA API.