Aphelops

Aphelops (Greek: "smooth" (apheles), "face" (ops), in a reference of lacking a horn[1]) is an extinct genus of hornless rhinocerotids endemic to North America.

[6] Aphelops can be distinguished by other members of the Aceratheriinae by two traits: the arched top of the skull, and the long diastema (gap) between the second incisor (lower tusk) and first premolar.

[7] Aphelops is thought to have been a browser on C3 plants, like the modern black rhinoceros, with its longer limbs adapted to traversing open, brushy country.

Isotopic evidence suggests that, in the late Miocene, Teleoceras had limited intake on newly-emergent C4 grasses, but Aphelops continued to browse.

Both went extinct at the end of the Hemphillian North American land mammal age, most likely due to rapid climate cooling, increased seasonality and expansion of C4 grasses.

Skull of A. malacorhinus