Classification of Fremd 1994
G. †Nimravus Cope 1879
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†Nimravus davisi Merriam 1906
†Nimravus debilis Cope 1879
†Nimravus platycopis Cope 1879
G. †Perchoerus Leidy 1869
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†Perchoerus lentus Marsh 1875
†Perchoerus osmonti Sinclair 1905
G. †Eucrotaphus Leidy 1850
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†Eucrotaphus trigonocephalus Cope 1884
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Invalid names: Pseudogenetochoerus covensis Schultz and Falkenbach 1968 [synonym]
G. †Merycochoerus Leidy 1858
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†Merycochoerus occidentalis Marsh 1873
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Invalid names: Eporeodon leptacanthus Cope 1884 [synonym], Eucrotaphus pacificus Cope 1884 [synonym]
Fm. Equidae Gray 1821 [horse]
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†Diceratherium annectens Marsh 1873
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Invalid names: Rhinoceros hesperius Leidy 1865 [synonym]
†Diceratherium armatum Marsh 1875
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Invalid names: Diceratherium nanum Marsh 1875 [synonym], Rhinoceros oregonensis Marsh 1873 [synonym], Rhinoceros pacificus Leidy 1872 [synonym]
†Merychippus relictus Cope 1889
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Invalid names: Anchippus brevidens Marsh 1874 [synonym]
†Merychippus seversus Cope 1878
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Invalid names: Hippotherium isonesum Cope 1889 [synonym]