Classification of Dingus 1990
†Archaeohippus blackbergi Hay 1924
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Invalid names: Archaeohippus nanus Simpson 1932 [synonym], Parahippus minutalis Hay 1924 [synonym]
†Archaeohippus ultimus Cope 1886
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Invalid names: Anchitherium minimus Douglass 1899 [synonym]
†Merychyus calaminthus Jahns 1940
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Invalid names: Merychyus crabilli Schultz and Falkenbach 1947 [synonym], Merychyus jahnsi Whistler 1967 [synonym]
†Merychyus relictus Matthew and Cook 1909
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†Merychyus relictus taylori Schultz and Falkenbach 1947