Classification of Quinn 1955
Or. Perissodactyla Owen 1848 [odd-toed ungulate]
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Fm. Equidae Gray 1821 [horse]
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Subfm. †Anchitheriinae Leidy 1869 [anchitheriine horse]
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G. †Archaeohippus Gidley 1906
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†Archaeohippus blackbergi Hay 1924
†Archaeohippus ultimus Cope 1886
Subfm. Equinae Steinmann and Döderlein 1890
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Tr. Equini Quinn 1955 [horse]
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G. †Asinus Gray 1822
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†Asinus cumminsii Cope 1893
†Asinus francisci Hay 1915
†Asinus mexicanus Lance 1950
G. †Dinohippus Quinn 1955
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†Dinohippus interpolatus Cope 1893
†Dinohippus leidyanus Osborn 1918
†Dinohippus subvenus Quinn 1955
G. †Hippotigris Hamilton-Smith 1841
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Hippotigris burchelli Gray 1824 [Burchell's zebra]
†Hippotigris capensis Broom 1909
†Hippotigris clarendonensis Quinn 1955
Hippotigris grevyi Oustalet 1882
†Hippotigris osborni Frick 1921
†Hippotigris parastylus Quinn 1955
Hippotigris robustus Pomel 1853
†Hippotigris sellardsi Quinn 1955
†Hippotigris shoshonensis Gidley 1930
†Hippotigris simplicidens Cope 1892
Hippotigris stenonis Cocchi 1867
Hippotigris zebra Linnaeus 1758 [mountain zebra]
Tr. †Hipparionini Quinn 1955 [hipparionine horse]
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G. †Hipparion de Christol 1832
G. †Merychippus Leidy 1856
G. †Nannippus Matthew 1926
G. †Neohipparion Gidley 1903
Invalid names: Calippini Quinn 1955 [empty], Protohippini Quinn 1955 [empty]