Classification of Froehlich 2002
Unr. †Hippomorpha
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Fm. Equidae Gray 1821 [horse]
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G. †Arenahippus Froehlich 2002
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†Arenahippus aemulor Gingerich 1991
†Arenahippus grangeri Gingerich 1989
†Arenahippus pernix Marsh 1876
G. †Eohippus Marsh 1876
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†Eohippus angustidens Cope 1875
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Invalid names: Eohippus validus Marsh 1876 [synonym], Hyracotherium cuspidatum Cope 1875 [synonym], Hyracotherium seekinsi Morris 1968 [synonym]
G. †Epihippus Marsh 1878
G. †Protorohippus Wortman 1896
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†Protorohippus montanum Wortman 1896
†Protorohippus venticolum Cope 1881
G. †Xenicohippus Bown and Kihm 1981
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†Xenicohippus craspedotum Cope 1880
†Xenicohippus grangeri Bown and Kihm 1981
†Xenicohippus osborni Bown and Kihm 1981
G. †Hallensia Franzen and Haubold 1986
Fm. †Palaeotheriidae Bonaparte 1850
Invalid names: Equoidea Hay 1902 [synonym]