Classification of Gidley 1903
†Equus minutus Cope 1893
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†Equus phlegon Hay 1899
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G. Equus Linnaeus 1758 [horse]
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G. †Hippotherium Kaup 1832
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†Hippotherium affine Leidy 1869
†Hippotherium occidentale Leidy 1856
G. †Protohippus Leidy 1858
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†Protohippus cumminsii Cope 1893
†Protohippus interpolatus Cope 1893
†Protohippus mirabilis Leidy 1858
†Protohippus parvulus Marsh 1868
†Protohippus pernix Marsh 1874
Invalid names: Pliohippus Marsh 1874 [synonym]