Classification of Dalquest and Hughes 1966

G. †Calippus Matthew and Stirton 1930
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†Calippus placidus Leidy 1869
G. †Nannippus Matthew 1926
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†Nannippus gratus Leidy 1869
G. †Neohipparion Gidley 1903
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G. †Pliohippus Marsh 1874
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†Pliohippus fossulatus Cope 1893