|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Mammalia - Artiodactyla - Merycoidodontidae
It was recombined as Eporeodon major by Marsh (1875), Thorpe (1921), Thorpe (1924), Thorpe (1937), Scott (1940) and Galbreath (1953); it was recombined as Eucrotaphus major by Cope (1884); it was recombined as Eucrotaphus (Oreodon) major by Scott and Osborn (1887); it was recombined as Paramerycoidodon major by Schultz and Falkenbach (1968); it was recombined as Mesoreodon major by Fremd (1994) and Lander (1998); it was recombined as Merycoidodon major by Stevens and Stevens (1996) and Stevens and Stevens (2007).
|Year||Name and author|
|1853||Oreodon major Leidy|
|1856||Oreodon major Leidy p. 164|
|1857||Oreodon major Leidy p. 89|
|1869||Oreodon hybridus Leidy|
|1875||Eporeodon major Marsh p. 250|
|1884||Eucrotaphus major Cope p. 517|
|1887||Eucrotaphus (Oreodon) major Scott and Osborn p. 155|
|1921||Eporeodon major Thorpe|
|1924||Eporeodon hybridus Thorpe|
|1924||Eporeodon major Thorpe|
|1937||Eporeodon major Thorpe|
|1940||Eporeodon major Scott p. 679|
|1949||Promesoreodon scanloni Schultz and Falkenbach p. 152 figs. 21-25|
|1953||Eporeodon major Galbreath|
|1954||Pseudodesmatochoerus milleri Schultz and Falkenbach p. 209 figs. 12-15, 18|
|1954||Subdesmatochoerus shannonensis Schultz and Falkenbach p. 223 figs. 19 - 21|
|1968||Genetochoerus chamberlaini Schultz and Falkenbach|
|1968||Merycoidodon lambi Schultz and Falkenbach|
|1968||Merycoidodon lynchi Schultz and Falkenbach|
|1968||Otionohyus alexi Schultz and Falkenbach|
|1968||Otionohyus hybridus Schultz and Falkenbach|
|1968||Paramerycoidodon major Schultz and Falkenbach|
|1968||Paramerycoidodon wanlessi Schultz and Falkenbach|
|1994||Mesoreodon major Fremd|
|1996||Merycoidodon major Stevens and Stevens|
|1998||Mesoreodon major Lander|
|2007||Merycoidodon major Stevens and Stevens p. 160|
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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 1949 (Promesoreodon scanloni)||SKULL: Small; see generic characters.
MANDIBLE: Light; see generic characters.
DENTITION:Brachyodont; series of less length than that in known species of Mesoreo- don; pa with anterior internal pits and P' with external anterior pit (not observable in well-worn specimens).
LIMBS: Short and light, equal to small examples of Merycoidodon culbertsonii.
|C. B. Schultz and C. H. Falkenbach 1954 (Pseudodesmatochoerus milleri)||SKULL: Medium size; tendency to be slightly smaller than examples of P. koffmani, larger than in P. longiceps; supraoccipital wings with less spread than in P. longiceps; sagittal crest with slightly depressed medial region, not so pronounced as in examples of P. koffmani; nasals long and light, with slight anterior retraction, less retraction than in latter species; anterior nasal-maxilla contact above P1, slightly more anterior than in examples of P. koffmani; infraorbital foramen above PLP 4; bulla of moderate size, smaller than other examples of genus; post-glenoid process more peg-shaped than in examples of P. kojfmani (closer to that of P. longiceps in this respect, but with less height).
MANDIBLE: Postsymphysis below anterior portion of Pa; posterior border of ascending ramus lighter than in P. longiceps. ·
DENTITION: Series approximately same size as examples of P. koffmani, larger than in P. longiceps, slightly longer than in P. wascoensis; more robust than in latter two species.
|C. B. Schultz and C. H. Falkenbach 1954 (Subdesmatochoerus shannonensis)||SKULL: Slightly larger than in S. socialis, smaller than that of holotype of S. montanus; exoccipital vacuities moderately large, smaller than those in S. montanus; zygomatic arch with less abrupt posterior rise and inward notch below posterior aspect of orbit more pronounced than in S. socialis; paroccipital process heavier at base than in that species; bulla similar to that in S. socialis except for less prominent external posterior groove and pit for hyoid attachment.
MANDIBLE: Slightly smaller than in holotype of S. montanus; larger than other forms of the genus.
DENTITION: Series with average length greater than that in S. socialis; anterior intermediate crests on PLP 3 each well de- veloped (a remnant of an analogous crest indicated in unworn C/).
LIMBS: Slightly larger and more robust than in S. socialis. (Known from fragmentary specimens only.)