Full reference: P. O. McGrew, J. E. Berman, M. K. Hecht, J. M. Hummel, G. G. Simpson and A. E. Wood. 1959. The geology and paleontology of the Elk Mountain and Tabernacle Butte area, Wyoming. Bulletin of the American Museum of Natural History 117(3):117-176
Sister taxa: none
Type specimen: AMNH 3829. Its type locality is Hyopsodus Hill, which is in a Bridgerian terrestrial horizon in the Bridger Formation of Wyoming.
Ecology: fossorial carnivore