Classification of Cope 1884
Subor. Ruminantia Scopoli 1777 [ruminant]
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Fm. †Oreodontidae Leidy 1869
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G. †Agriochoerus Leidy 1850
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†Agriochoerus antiquus Leidy 1850
†Agriochoerus guyotianus Cope 1878
†Agriochoerus latifrons Leidy 1869
†Agriochoerus major Leidy 1856
†Agriochoerus ryderanus Cope 1881
†Agriochoerus trifrons Cope 1884
G. †Cyclopidius Cope 1877
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†Cyclopidius emydinus Cope 1884
Invalid names: Brachymeryx Cope 1877 [synonym]
G. †Eucrotaphus Leidy 1850
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†Eucrotaphus jacksoni Leidy 1850
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†Eucrotaphus jacksoni jacksoni Cope 1884
†Eucrotaphus jacksoni leptacanthus Cope 1884
†Eucrotaphus jacksoni pacificus Cope 1884
Invalid names: Oreodon bullatus Leidy 1869 [synonym], Oreodon occidentalis Marsh 1873 [synonym]
†Eucrotaphus trigonocephalus Cope 1884
G. †Leptauchenia Leidy 1856
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†Leptauchenia decora Leidy 1856
†Leptauchenia major Leidy 1856
†Leptauchenia nitida Leidy 1869
G. †Merychyus Leidy 1858
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†Merychyus elegans Leidy 1858
†Merychyus major Leidy 1858
†Merychyus medius Leidy 1858
†Merychyus pariogonus Cope 1884
†Merychyus zygomaticus Cope 1878
Invalid names: Ticholeptus Cope 1878 [synonym]
G. †Merycochoerus Leidy 1858
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†Merycochoerus chelydra Cope 1884
†Merycochoerus leidyi Bettany 1876
†Merycochoerus macrostegus Cope 1884
†Merycochoerus montanus Cope 1884
†Merycochoerus proprius Leidy 1858
†Merycochoerus rusticus Leidy 1870
G. †Oreodon Leidy 1851
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†Oreodon affinis Leidy 1869
†Oreodon gracilis Leidy 1851
Invalid names: Cotylops Leidy 1851 [synonym], Merycoidodon Leidy 1848 [nomen nudum]
G. †Pithecistes Cope 1877
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†Pithecistes brevifacies Cope 1877
†Pithecistes decedens Cope 1884
†Pithecistes heterodon Cope 1877