Classification of Scott 1940
G. †Elotherium Pomel 1847
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Or. Artiodactyla Owen 1848 [even-toed ungulate]
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Unr. Ruminantia Scopoli 1777 [ruminant]
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Subor. Tylopoda Illiger 1811
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Superfm. †Hypertraguloidea Scott 1940
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Fm. †Hypertragulidae Cope 1879
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Subfm. †Leptomerycinae Zittel 1893
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G. †Leptomeryx Leidy 1853
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†Leptomeryx esulcatus Cope 1889
†Leptomeryx evansi Leidy 1853
†Leptomeryx semicinctus Cope 1889
†Leptomeryx speciosus Lambe 1908
Invalid names: Trimerodus Cope 1873 [synonym]
Invalid names: Hypertragulinae [empty]
Fm. †Protoceratidae Marsh 1891 [protoceratid]
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G. †Protoceras Marsh 1891
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†Protoceras celer Marsh 1891
†Protoceras comptus Marsh 1894
†Protoceras nasutus Marsh 1897
Invalid names: Cameloidea [empty], Oreodontoidea Gill 1872 [empty]
Subor. Suina Gray 1868
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Fm. Tayassuidae Palmer 1897 [peccary]
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G. †Perchoerus Leidy 1869
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†Perchoerus minor Cook 1922
†Perchoerus nanus Marsh 1894
†Perchoerus probus Leidy 1856
Invalid names: Ancodonta Matthew [empty], Palaeodonta Matthew [empty]