Classification of MacFadden 1984
G. †Astrohippus Stirton 1940
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†Astrohippus ansae Matthew and Stirton 1930
†Astrohippus stocki Lance 1950
G. †Dinohippus Quinn 1955
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†Dinohippus leidyanus Osborn 1918
†Dinohippus mexicanus Lance 1950
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Invalid names: Equus (Dolichohippus) mesamexicanus Mooser 1973 [synonym], Hippotigris ocotensis Mooser 1958 [synonym], Protohippus muelleri Mooser 1964 [synonym]
G. †Pliohippus Marsh 1874
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†Pliohippus fossulatus Cope 1893
†Pliohippus pachyops Cope 1893
†Astrohippus stockii Lance 1950
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Invalid names: Astrohippus albidens Mooser 1968 [synonym]