Classification of Wilson 1971
G. †Agriochoerus Leidy 1850
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†Agriochoerus guyotianus Cope 1878
Invalid names: Agriomeryx Marsh 1894 [synonym], Artionyx Osborn and Wortman 1893 [synonym], Coloreodon Cope 1879 [synonym], Eucrotaphus Leidy 1850 [synonym], Merycopater Cope 1879 [synonym]
G. †Protoreodon Scott and Osborn 1887
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†Protoreodon minimus Douglass 1902
Invalid names: Chorotherium Berg 1899 [synonym], Eomeryx Marsh 1894 [synonym], Hyomeryx Marsh 1894 [synonym], Mesagriochoerus Peterson 1934 [synonym], Protagriochoerus Scott 1899 [synonym]
Fm. †Merycoidodontidae Cook 1912 [oreodont]
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†Protoreodon pumilus Marsh 1875
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Invalid names: Mesagriochoerus primus Peterson 1934 [synonym], Protagriochoerus annectens Scott 1899 [synonym], Protoreodon medius Peterson 1919 [synonym], Protoreodon tardus Scott 1945 [synonym]