Temporal range: Pleistocene–0.009
Fossils found in Mexico, Texas, Arizona, New Mexico, Oklahoma, Kansas and Florida have been identified as Equus conversidens. In January 1963, a partial skeleton of Equus conversidens was found in the city of Canyon, Texas in a white clay bed during the excavation of a basement.  The species was medium to small-sized.
- "†Equus conversidens Owen 1869—Mexican Horse". University of Texas at El Paso. Retrieved May 6, 2011.
- Walter W. Dalquest and Jack T. Hughes, “The Pleistocene Horse, Equus conversidens,” American Midland Naturalist. Vol. 74, No. 2 (Oct., 1965), pp. 408-417 Published by: The University of Notre Dame. Stable URL: http://www.jstor.org/stable/2423270.