Classification of Forsten 1975

Or. Perissodactyla Owen 1848 [odd-toed ungulate]
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Subor. †Hippomorpha
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Fm. Equidae Gray 1821 [horse]
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Subfm. †Anchitheriinae Leidy 1869 [anchitheriine horse]
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G. †Anchitherium von Meyer 1844
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Invalid names: Anchitherium clarencei Simpson 1932 [synonym]
G. †Archaeohippus Gidley 1906
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Invalid names: Archaeohippus nanus Simpson 1932 [synonym], Parahippus minutalis Hay 1924 [synonym]
G. †Hypohippus Leidy 1858
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†Hypohippus affinis Leidy 1858
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Invalid names: Anchitherium australis Leidy 1873 [synonym]
G. †Parahippus Leidy 1858
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†Parahippus leonensis Sellards 1916
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Invalid names: Merychippus socius Hay 1924 [synonym], Merychippus vellicans Hay 1924 [synonym], Parahippus barbouri White 1942 [synonym]
†Parahippus texanus Leidy 1868
Invalid names: Anchippus Leidy 1868 [synonym]
Subfm. Equinae Steinmann and Döderlein 1890
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G. †Calippus Matthew and Stirton 1930
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†Calippus francisi Hay 1924
†Calippus regulus Johnston 1937
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Invalid names: Calippus anatinus Quinn 1955 [synonym]
G. †Merychippus Leidy 1856
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†Merychippus circulus Quinn 1955
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Invalid names: Eoequus wilsoni Quinn 1955 [synonym]
†Merychippus gunteri Simpson 1930
†Merychippus perditus Leidy 1858
†Merychippus vetus Quinn 1955
Invalid names: Eoequus Quinn 1955 [synonym]
G. †Pliohippus Marsh 1874
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Subg. †Pliohippus (Astrohippus) Stirton 1940
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Subg. †Pliohippus (Pliohippus) Stirton 1940
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G. †Neohipparion Gidley 1903
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G. †Nannippus Matthew 1926
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†Nannippus ingenuum Leidy 1885
†Nannippus lenticulare Cope 1893
G. †Pseudhipparion Ameghino 1904
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†Pseudhipparion optimum Quinn 1955
Invalid names: Griphippus Quinn 1955 [synonym]
†Pliohippus martini Hesse 1936
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Invalid names: Equus laparensis Quinn 1955 [synonym], Hippotigris parastylus Quinn 1955 [synonym], Hippotigris sellardsi Quinn 1955 [synonym]
†Pliohippus supremus Leidy 1869
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Invalid names: Dinohippus subvenus Quinn 1955 [synonym]