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Megoreodon grandis

Mammalia - Artiodactyla - Merycoidodontidae

Taxonomy
Promerycochoerus grandis was named by Douglass (1907). Its type specimen is CMN 990, a partial skeleton (a .skull with mandible, cervical and lumbar vertebrre, a femur, a humerus, portions of a scapula, a radius, an ulna, a pelvis and a tibia.), and it is a 3D body fossil.

It was synonymized subjectively with Promerycochoerus montanus by Thorpe (1937); it was synonymized subjectively with Merycochoerus superbus by Lander (1998) and Tabrum and Nichols (2001); it was recombined as Megoreodon grandis by Schultz and Falkenbach (1940), Schultz and Falkenbach (1954) and Stevens and Stevens (2007).

Synonyms
Synonymy list
YearName and author
1907Promerycochoerus grandis Douglass p. 104
1907Promerycochoerus hollandi Douglass p. 106 figs. Pl. 28
1934Promerycochoerus loomisi Schlaikjer
1940Megoreodon grandis Schultz and Falkenbach
1954Megoreodon grandis Schultz and Falkenbach p. 168
1968Megoreodon hollandi Skinner et al.
1970Megoreodon hollandi Macdonald
2007Megoreodon grandis 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
subfamilyPromerycochoerinae
genusMegoreodon
speciesgrandis()

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 1954SKULL: Large and massive (larger than examples of M. fricki, tendency to be smaller than those of M. grandis loomisi); infraorbital foramen above posterior portion of P4.
MANDIBLE:Smaller than in average examples of M. grandis loomisi.
DENTITION:Series similar to those of examples of M. grandis loomisi.
LIMBS: Approximately equal to those of other forms of genus.