Pliohippus


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Related to Pliohippus: Merychippus

Pliohippus

 

a genus of extinct horses that lived in the Pliocene epoch on the plains of North America. The Pliohippus were descendants of the Merychippus and predecessors of later horses, such as those of the genus Equus to which they were similar in size and the structure of the skull, teeth, and skeleton.

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Five taxa of equids were described from the ash bed by Voorhies (2006), including Neohipparion affine, Pseudhipparion gratum, Cormohipparion occidentale, Pliohippus pernix, and Protohippus simus.
In Pliohippus, the DPOF and malar fossa are well developed and are often strongly pocketed and complex.
The main differences lie in the abundances between Neohipparion, Pliohippus, Protohippus and, of course, Calippus (only present at a one locality).