Alternative combination: Plesiothomomys potomacensis
Full reference: J. W. Gidley and C. L. Gazin. 1933. New Mammalia in the Pleistocene fauna from Cumberland Cave. Journal of Mammology 14(4):343-357
Type specimen: USNM 8166, a mandible. Its type locality is Cumberland Cave, which is in an Irvingtonian cave horizon in Maryland.
Ecology: fossorial browser
Average measurements (in mm): m1 1.45 x 2.10