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Noun1.Protohippus - Pliocene horse approaching donkeys in sizeprotohippus - Pliocene horse approaching donkeys in size
Equus caballus, horse - solid-hoofed herbivorous quadruped domesticated since prehistoric times
genus Protohippus - a genus of Equidae
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References in periodicals archive ?
The two sites exhibit a notably similar composition of equid genera, including the tribes Equini (Pliohippus, Calippus, and Protohippus), and Hipparionini (Cormohipparion, Neohipparion, and Pseudhipparion).
To formulate the model, take the species Protohippus simus in Figure 1 as an example.