Classification of Gidley 1907
Fm. Equidae Gray 1821 [horse]
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Subfm. †Anchitheriinae Leidy 1869 [anchitheriine horse]
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G. †Anchitherium von Meyer 1844
G. †Hypohippus Leidy 1858
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†Hypohippus affinis Leidy 1858
†Hypohippus equinus Scott 1893
†Hypohippus osborni Gidley 1907
G. †Mesohippus Marsh 1875
G. †Parahippus Leidy 1858
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†Parahippus avus Marsh 1874
†Parahippus brevidens Marsh 1874
†Parahippus cognatus Leidy 1858
†Parahippus coloradensis Gidley 1907
†Parahippus crenidens Scott 1893
†Parahippus parvulus Marsh 1868
†Parahippus pawniensis Gidley 1907
†Parahippus texanus Leidy 1868
Invalid names: Anchippus Leidy 1868 [synonym], Desmatippus Scott 1893 [synonym]
Subfm. Equinae Steinmann and Döderlein 1890
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G. Equus Linnaeus 1758 [horse]
G. †Hippidion Owen 1869
Subfm. †Hyracotheriinae Cope 1881
Invalid names: Protohippinae Gidley 1907 [empty]