Classification of Morgan et al. 2009
Cl. Mammalia Linnaeus 1758 [mammal]
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Unr. Artiodactyla Owen 1848 [even-toed ungulate]
Or. Artiodactyla Owen 1848 [even-toed ungulate]
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Fm. †Oreodontidae Leidy 1869
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Subfm. †Ticholeptinae Schultz and Falkenbach 1941
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G. †Merychyus Leidy 1858
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†Merychyus arenarum Cope 1884
†Merychyus calaminthus Jahns 1940
†Merychyus elegans Leidy 1858
†Merychyus medius Leidy 1858
†Merychyus relictus Matthew and Cook 1909
Invalid names: Metoreodon Matthew and Cook 1909 [synonym], Ustatochoerus Schultz and Falkenbach 1941 [synonym]