Classification of Quinn 1957

Or. Perissodactyla Owen 1848 [odd-toed ungulate]
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Fm. Equidae Gray 1821 [horse]
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Tr. Equini Quinn 1955 [horse]
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G. †Asinus Gray 1822
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†Asinus conversidens Owen 1869
G. Equus Linnaeus 1758 [horse]
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Equus caballus Linnaeus 1758 [horse]
†Equus midlandensis Quinn 1957
†Equus pacificus Leidy 1868
G. Onager Brisson 1762
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Subg. †Onager (Hesperhippus) Hibbard 1955
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†Onager altidens Quinn 1957
†Onager fraternus Leidy 1858
†Onager lambei Hay 1917
†Onager littoralis Hay 1913
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Invalid names: Equus achates Hay and Cook 1930 [synonym]
†Onager onager Brisson 1762
†Onager semiplicatus Cope 1893
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Invalid names: Equus (Asinus) calobatus Troxell 1915 [synonym]