Classification of Tabrum and Nichols 2001
†Altippus taxus Douglass 1908
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†Mesohippus portentus Douglass 1908
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G. †Alphagaulus Korth 2000
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†Alphagaulus pristinus Douglass 1903
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Invalid names: Mylagaulus proximus Douglass 1903 [synonym]
G. †Neatocastor Korth 1996
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†Neatocastor hesperus Douglass 1902
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Invalid names: Steneofiber complexus Douglass 1902 [synonym]
Fm. †Merycoidodontidae Cook 1912 [oreodont]
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G. †Brachycrus Matthew 1901
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†Brachycrus laticeps Douglass 1900
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Invalid names: Merycochoerus altiramus Douglass 1901 [synonym], Merycochoerus elrodi Douglass 1901 [synonym], Merycochoerus madisonius Douglass 1901 [synonym]
G. †Hypsiops Schultz and Falkenbach 1950
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†Hypsiops bannackensis Douglass 1907
†Hypsiops breviceps Douglass 1907
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Invalid names: Ticholeptus brachymelis Douglass 1907 [synonym]
Fm. Camelidae Gray 1821 [camel]
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Invalid names: Gomphotherium serus Douglass 1899 [nomen dubium]
G. †Bouromeryx Skinner et al. 1977
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†Bouromeryx americanus Douglass 1899
†Bouromeryx madisonius Douglass 1899
G. †Epoicotherium Simpson 1927
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†Epoicotherium unicum Douglass 1905
Invalid names: Xenotherium Douglass 1905 [replaced]
†Aepycamelus robustus Leidy 1858
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Invalid names: Procamelus madisonius Douglass 1899 [synonym]
†Cynodesmus thooides Scott 1893
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Invalid names: Mesocyon drummondanus Douglass 1903 [synonym]
†Hyaenodon crucians Leidy 1853
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Invalid names: Hyaenodon minutus Douglass 1902 [synonym]
†Merychyus medius Leidy 1858
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Invalid names: Merycochoerus compressidens Douglass 1901 [synonym]
†Merycochoerus superbus Leidy 1870
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Invalid names: Promerycochoerus grandis Douglass 1907 [synonym], Promerycochoerus hatcheri Douglass 1907 [synonym], Promerycochoerus hollandi Douglass 1907 [synonym]
†Merycoides pariogonus Cope 1884
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Invalid names: Merycoides cursor Douglass 1907 [synonym]
†Merycoidodon bullatus Leidy 1869
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Invalid names: Eucrotaphus helenae Douglass 1902 [synonym]
†Merycoidodon culbertsonii Leidy 1848
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Invalid names: Oreodon macrorhinus Douglass 1903 [synonym]
†Mesoreodon chelonyx Scott 1893
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Invalid names: Desmatochoerus newchicagoensis Schultz and Falkenbach 1954 [synonym], Eucrotaphus montanus Douglass 1907 [synonym], Merycoides giganteus Schultz and Falkenbach 1949 [synonym], Mesoreodon latidens Douglass 1907 [synonym], Promerycochoerus erythroceps Stock 1932 [synonym], Promerycochoerus grinnelli Koerner 1940 [synonym], Promerycochoerus thorpei Koerner 1940 [synonym], Pseudodesmatochoerus hoffmani Schultz and Falkenbach 1954 [synonym]
†Palaearctomys montanus Douglass 1903
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Invalid names: Palaearctomys macrorhinus Douglass 1903 [synonym]
†Paradjidaumo trilophus Cope 1873
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Invalid names: Eumys minor Douglass 1902 [synonym]
†Peraceras profectum Matthew 1899
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Invalid names: Aphelops montanus Douglass 1908 [synonym]
†Peraceras superciliosum Cope 1880
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Invalid names: Aphelops ceratorhinus Douglass 1903 [synonym]
†Procamelus occidentalis Leidy 1858
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Invalid names: Procamelus lacustris Douglass 1899 [synonym]
†Ticholeptus zygomaticus Cope 1878
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Invalid names: Poatrephes paludicola Douglass 1903 [synonym]