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n.1.(Paleon.) An extinct Miocene mammal of the Horse family, closely related to the genus Anhithecrium, and having three usable hoofs on each foot.
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Mesohippus, Miohippus, and Merychippus are extinct horse species that date fifteen to thirty million years ago, spanning over three time periods in North America.
A fossil of Miohippus (little horse) was found at site H.