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Hesperohipparion (Mammalia: Equidae), a New Genus of Horse from the Hemphillian of North America, with Description of a New Species

Walter W. Dalquest
The Southwestern Naturalist
Vol. 25, No. 4 (Feb. 16, 1981), pp. 505-512
DOI: 10.2307/3670849
Stable URL: http://www.jstor.org/stable/3670849
Page Count: 8
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Hesperohipparion (Mammalia: Equidae), a New Genus of Horse from the Hemphillian of North America, with Description of a New Species
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Abstract

American hipparions are small to medium-sized horses with tridactyl feet and protocones of the upper cheek teeth usually isolated. Clarendonian genera include: Hipparion, Neohipparion, Cormohipparion, Nannippus, and possibly Pseudhipparion. By medial and late Hemphillian time, American genera included only Nannippus and a newly described genus, Hesperohipparion. Five Hemphillian species previously placed in Neohipparion are removed to Hesperohipparion and a new species, H. stirtoni, is described from the Coffee Ranch local fauna of Texas.

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