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 ultimus Cope 1886
Subfm. Equinae Steinmann and Döderlein 1890
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Tr. †Calippini Quinn 1955
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G. †Astrohippus Stirton 1940
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Astrohippus ansae Matthew and Stirton 1930
Astrohippus stockii Lance 1950
G. †Calippus Matthew and Stirton 1930
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Calippus anatinus Quinn 1955
Calippus francisi Hay 1924
Calippus optimus Quinn 1955
Calippus placidus Leidy 1869
G. †Griphippus Quinn 1955
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Griphippus gratus Leidy 1869
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 leidyanus Osborn 1918
Dinohippus subvenus Quinn 1955
G. †Eoequus Quinn 1955
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Eoequus wilsoni Quinn 1955
G. Equus Linnaeus 1758 [horse]
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Equus caballus Linnaeus 1758 [horse]
Equus laparensis Quinn 1955
G. †Hippotigris Hamilton-Smith 1841
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Hippotigris burchelli Gray 1824 [Burchell's zebra]
Hippotigris capensis Broom 1909
Hippotigris grevyi Oustalet 1882
Hippotigris osborni Frick 1921
Hippotigris parastylus Quinn 1955
Hippotigris sellardsi Quinn 1955
Hippotigris shoshonensis Gidley 1930
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
Tr. †Protohippini Quinn 1955 [protohippines]
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G. †Hippodon Leidy 1854
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Hippodon barbouri White 1942
Hippodon gunteri Simpson 1930
Hippodon leonensis Sellards 1916
Hippodon speciosus Leidy 1854
Hippodon vellicans Hay 1924
G. †Pliohippus Marsh 1874
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Pliohippus circulus Quinn 1955
Pliohippus intermontanus Merriam 1915
Pliohippus leardi Drescher 1941
Pliohippus mirabilis Leidy 1858
Pliohippus pernix Marsh 1874
Pliohippus spectans Cope 1880
Pliohippus supremus Leidy 1869
G. †Protohippus Leidy 1858
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Protohippus martini Hesse 1936
Protohippus perditus Leidy 1858
Protohippus vetus Quinn 1955