Classification of Olson and McGrew 1941

G. †Merychippus Leidy 1856
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Invalid names: Protohippus Leidy 1858 [synonym]
G. †Neohipparion Gidley 1903
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†Neohipparion montezuma Leidy 1882
G. †Pliohippus Marsh 1874
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†Pliohippus hondurensis Olson and McGrew 1941