Classification of the species Merychyus medius
†Ustatochoerus medius Leidy 1858
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†Ustatochoerus medius novomexicanus Frick 1929
Invalid names: Merychyus medius novomexicanus Frick 1929 [invalid subgroup], Merycochoerus coenopus Scott 1890 [synonym], Merycochoerus compressidens Douglass 1901 [synonym]
†Ustatochoerus medius mohavensis Schultz and Falkenbach 1941
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