Classification of Macdonald 1951

G. †Apternodus Matthew 1903
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†Apternodus bicuspis Macdonald 1951
G. †Archaeotherium Leidy 1850
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Subg. †Archaeotherium (Pelonax) Cope 1873
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G. †Mesohippus Marsh 1875
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†Mesohippus meteulophus Osborn 1904
†Mesohippus portentus Douglass 1908
†Mesohippus trigonostylus Osborn 1918
G. †Miohippus Marsh 1874
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†Miohippus intermedius Osborn and Wortman 1895
†Miohippus validus Osborn 1904
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Invalid names: Mesohippus grallipes Sinclair 1925 [synonym]
G. †Pliohippus Marsh 1874
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†Pliohippus simus Gidley 1906
†Pliohippus supremus Leidy 1869