Mammalia - Rodentia - Zapodidae

Full reference: M. Green. 1977. Journal of Paleontology 51(5)

Belongs to Macrognathomys according to M. Green 1977

Sister taxon: Macrognathomys nanus

Type specimen: Its type locality is Glenn Olson Quarry, which is in a Barstovian channel horizon in the Fort Randall Formation of South Dakota

Ecology: ground dwelling herbivore

Average measurements (in mm): m1 1.07 x 0.80