Classification of Froehlich 2002

G. †Cymbalophus Hooker 1980
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Cymbalophus cuniculus Owen 1842
Unr. Tapiromorpha Haeckel 1873
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G. †Systemodon Cope 1881
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Systemodon tapirinus Cope 1875
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Invalid names: Hyracotherium cristatum Wortman 1896 [synonym]
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. †Minippus Froehlich 2002
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Minippus index Cope 1873
Minippus jicarillai Froehlich 2002
G. †Orohippus Marsh 1872
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Orohippus major Marsh 1874
Orohippus pumilus Marsh 1871
G. †Pliolophus Owen 1858
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Pliolophus vulpiceps Owen 1858
G. †Protorohippus Wortman 1896
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Protorohippus montanum Wortman 1896
G. †Sifrhippus Froehlich 2002
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Sifrhippus sandrae Gingerich 1989
G. †Xenicohippus Bown and Kihm 1981
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Xenicohippus grangeri Bown and Kihm 1981
Xenicohippus osborni Bown and Kihm 1981
G. †Hallensia Franzen and Haubold 1986
G. †Hyracotherium Owen 1841
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Fm. †Palaeotheriidae Bonaparte 1850
Invalid names: Equoidea Hay 1902 [synonym]