Mammalia - Artiodactyla - Protoceratidae

Full reference: H. J. Cook. 1934. New artiodactyls from the Oligocene and Lower Miocene of Nebraska. American Midland Naturalist 15(2):148-165

Belongs to Pseudoprotoceras according to H. J. Cook 1934

Sister taxa: Pseudoprotoceras minor, Pseudoprotoceras semicinctus, Pseudoprotoceras taylori

Type specimen: No. HC507, a partial skeleton (anterior portion of a skull with associated astragalus and navicular). Its type locality is Chadronia Pocket, which is in a Chadronian terrestrial siltstone in the Chadron Formation of Nebraska.

Ecology: ground dwelling browser

Average measurements (in mm): P1 3.00 x 1.50, P2 8.00 x 3.00, P3 9.00 x 6.00, P4 6.00 x 8.00, M1 9.69 x 11.16, M2 11.3 x 13.4, M3 11.1 x 12.7, m1 8.53 x 7.04, m2 10.2 x 8.3, m3 14.1 x 7.8