Classification of Webb 1969
†Aelurodon meandrinus Hatcher 1894
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†Procamelus inaequidens Cope and Matthew 1915
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†Protolabis francisi Hay 1924
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†Protolabis prehensilis Cope 1881
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G. †Brachypsalis Cope 1890
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†Brachypsalis pristinus Matthew and Gidley 1904
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Invalid names: Brachypsalis obliquidens Sinclair 1915 [synonym]
G. Martes Frisch 1775 [marten]
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G. †Ischyrocyon Matthew and Gidley 1904
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†Ischyrocyon gidleyi Matthew 1902
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Invalid names: Ischyrocyon hyaenodus Matthew and Gidley 1904 [synonym], Pliocyon walkerae Johnston and Christian 1941 [synonym]
†Ischyrocyon mohavensis Stock and Furlong 1926
Invalid names: Hadrocyon Stock and Furlong 1926 [synonym]
G. †Protolabis Cope 1876
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†Protolabis fissidens Cope 1876
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Invalid names: Protolabis montanus Douglass 1899 [synonym], Protolabis princetonianus Sinclair 1915 [synonym]
†Protolabis heterodontus Cope 1874
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Invalid names: Procamelus angustidens Cope 1874 [synonym], Procamelus foxi Macdonald 1960 [synonym]
G. †Sphenophalos Merriam 1909
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†Sphenophalos floblairi Frick 1937
Invalid names: Plioceros Frick 1937 [synonym]
G. †Astrohippus Stirton 1940
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†Astrohippus ansae Matthew and Stirton 1930
†Astrohippus martini Hesse 1936
G. †Pliohippus Marsh 1874
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†Pliohippus mexicanus Lance 1950
†Pliohippus supremus Leidy 1869
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Invalid names: Dinohippus subvenus Quinn 1955 [synonym], Hippotigris clarendonensis Quinn 1955 [synonym], Hippotigris parastylus Quinn 1955 [synonym], Pliohippus lullianus Troxell 1916 [synonym], Protohippus fossulatus Cope 1893 [synonym]
G. †Pseudhipparion Ameghino 1904
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†Pseudhipparion gratum Leidy 1869
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Invalid names: Hippodon speciosus Leidy 1854 [synonym], Neohipparion niobrarense Gidley 1906 [synonym]
†Pseudhipparion retrusum Cope 1889
Invalid names: Griphippus Quinn 1955 [synonym], Hippodon Leidy 1854 [synonym]
†Calippus anatinus Quinn 1955
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Invalid names: Astrohippus curtivallis Quinn 1955 [synonym], Calippus optimus Quinn 1955 [synonym]
†Cosoryx furcatus Leidy 1869
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Invalid names: Cosoryx (Paracosoryx) burgensis Frick 1937 [synonym], Cosoryx burgensis Frick 1937 [synonym]
†Cranioceras unicornis Matthew 1918
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Invalid names: Cervavus sinclairi Matthew 1918 [synonym], Cranioceras dakotensis Frick 1937 [synonym], Cranioceras granti Frick 1937 [synonym], Cranioceras mefferdi Frick 1937 [synonym]
†Leptarctus primus Leidy 1856
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Invalid names: Hypsoparia bozemanensis Dorr 1954 [synonym]
†Neohipparion occidentale Leidy 1856
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Invalid names: Hipparion affine Leidy 1869 [synonym], Hipparion dolichops Gidley 1906 [synonym]
†Procamelus grandis Gregory 1939
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Invalid names: Procamelus dakotensis Green 1956 [synonym]
†Procamelus occidentalis Leidy 1858
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Invalid names: Procamelus lacustris Douglass 1899 [synonym]
†Procamelus robustus Leidy 1858
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Invalid names: Homocamelus caninus Leidy 1869 [synonym], Procamelus madisonius Douglass 1899 [synonym]