Classification of Storer and Bryant 1993
†Chalicotherium bilobatum Cope 1889
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G. †Oreinotherium Russell 1934
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G. †Archaeohippus Gidley 1906
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G. †Mesohippus Marsh 1875
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†Mesohippus propinquus Lambe 1905
†Mesohippus westoni Cope 1889
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Invalid names: Mesohippus montanensis Osborn 1904 [synonym], Mesohippus praecocidens Lambe 1905 [synonym]
G. †Miohippus Marsh 1874
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†Miohippus assiniboiensis Lambe 1905
†Miohippus grandis Clark and Beerbower 1967