|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Mammalia - Artiodactyla - Merycoidodontidae
It was recombined as Metoreodon medius by Thorpe (1937); it was recombined as Ustatochoerus medius by Schultz and Falkenbach (1941), Schultz and Falkenbach (1947), Galbreath (1953), Cassiliano (1980), Stevens and Stevens (1989), Voorhies (1990) and Stevens and Stevens (2007).
|Year||Name and author|
|1858||Merychyus medius Leidy p. 26|
|1884||Merychyus medius Cope p. 545|
|1890||Merycochoerus coenopus Scott|
|1890||Merycochoerus cenopus Scott and Osborn p. 73|
|1937||Metoreodon medius Thorpe|
|1941||Ustatochoerus medius Schultz and Falkenbach p. 23|
|1947||Ustatochoerus medius Schultz and Falkenbach|
|1953||Ustatochoerus medius Galbreath|
|1980||Ustatochoerus medius Cassiliano|
|1988||Merychyus medius Kelly and Lander|
|1989||Merychyus medius Lander and Kelly|
|1989||Ustatochoerus medius Stevens and Stevens|
|1990||Ustatochoerus medius Voorhies|
|1998||Merychyus medius Lander|
|2007||Ustatochoerus medius Stevens and Stevens p. 166|
|2009||Merychyus medius Morgan et al. p. 95|
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
|C. B. Schultz and C. H. Falkenbach 1941||
SKULL.-Smaller than that of U. profectus but larger than that of U.? schrammi; nasals longest of genus (in proportion to size of skull); anterior tip of nasals retracted to region above PLP 2•
MANDIBLE.-Typical of genus; similar to that of U. profectus except for smaller size.
DENTITION.-Cusps on superior and inferior premolars not as well developed as in U. major or U. profectus.
LIMBs.-Smaller than those of U. profectus.