was named by Matthew (1921) ["genotype"]. Its type specimen is A.M. No. 1903, a partial skull (anterior portion of skull with part of the upper dentition, and the right ramus of the mandible with all teeth except P4), and it is a 3D body fossil. Its type locality is Wagonhound Canyon (Uinta B2)
, which is in an Uintan terrestrial horizon in the Uinta Formation of Utah.
It was recombined as Stehlinella uintensis
by Matthew (1929)
and Gazin (1958)
; it was recombined as Apatemys uintensis
by West (1973)