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Merycoidodon major

Mammalia - Artiodactyla - Merycoidodontidae

Taxonomy
Oreodon major was named by Leidy (1853) [also said to be 1854].

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).

Synonyms
Synonymy list
YearName and author
1853Oreodon major Leidy
1856Oreodon major Leidy p. 164
1857Oreodon major Leidy p. 89
1869Oreodon hybridus Leidy
1875Eporeodon major Marsh p. 250
1884Eucrotaphus major Cope p. 517
1887Eucrotaphus (Oreodon) major Scott and Osborn p. 155
1921Eporeodon major Thorpe
1924Eporeodon hybridus Thorpe
1924Eporeodon major Thorpe
1937Eporeodon major Thorpe
1940Eporeodon major Scott p. 679
1949Promesoreodon scanloni Schultz and Falkenbach p. 152 figs. 21-25
1953Eporeodon major Galbreath
1954Pseudodesmatochoerus milleri Schultz and Falkenbach p. 209 figs. 12-15, 18
1954Subdesmatochoerus shannonensis Schultz and Falkenbach p. 223 figs. 19 - 21
1968Genetochoerus chamberlaini Schultz and Falkenbach
1968Merycoidodon lambi Schultz and Falkenbach
1968Merycoidodon lynchi Schultz and Falkenbach
1968Otionohyus alexi Schultz and Falkenbach
1968Otionohyus hybridus Schultz and Falkenbach
1968Paramerycoidodon major Schultz and Falkenbach
1968Paramerycoidodon wanlessi Schultz and Falkenbach
1994Mesoreodon major Fremd
1996Merycoidodon major Stevens and Stevens
1998Mesoreodon major Lander
2007Merycoidodon major Stevens and Stevens p. 160

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
Amniota
RankNameAuthor
Synapsida()
Therapsida()
infraorderCynodontia()
Epicynodontia
infraorderEucynodontia
Probainognathia
Mammaliamorpha
Mammaliaformes
classMammalia
orderArtiodactyla()
suborderTylopoda()
superfamilyOreodontoidea
familyMerycoidodontidaeThorpe 1923
subfamilyMerycoidodontinae
genusMerycoidodon
speciesmajor(Leidy 1853)

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.

Diagnosis
ReferenceDiagnosis
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.
LIMBS: (Unknown).
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.)