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Desmatochoerus megalodon

Mammalia - Artiodactyla - Merycoidodontidae

Taxonomy
Mesoreodon megalodon was named by Peterson (1907). Its type specimen is CM 1325, a partial skull (front of the skull and lower jaws of a young individual, but with all the permanent teeth in position), and it is a 3D body fossil. Its type locality is Lower Monroe Creek, which is in an Arikareean terrestrial horizon in Nebraska.

It was synonymized subjectively with Eporeodon latidens by Lander (1998); it was recombined as Desmatochoerus megalodon by Stevens and Stevens (1996) and Stevens and Stevens (2007).

Synonyms
Synonymy list
YearName and author
1906Mesoreodon megalodon Peterson
1907Mesoreodon megalodon Peterson p. 24
1921Promerycochoerus (Desmatochoerus) curvidens Thorpe p. 241 figs. 6A, B
1924Promerycochoerus gregoryi Loomis
1933Hypselochoerus gregoryi Loomis
1937Promerycochoerus gregoryi Thorpe
1949Mesoreodon megalodon Schultz and Falkenbach p. 145 figs. 7, 16, 17, 19, 20, 25, 26
1954Desmatochoerus curvidens Schultz and Falkenbach p. 182 figs. 4-7
1963Desmatochoerus curvidens Macdonald
1970Desmatochoerus curvidens Macdonald
1996Desmatochoerus megalodon Stevens and Stevens
2007Desmatochoerus megalodon 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
genusDesmatochoerus()
speciesmegalodon()

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
M. R. Thorpe 1921 (Promerycochoerus (Desmatochoerus) curvidens)Small size; infra-orbital foramen above posterior part of P3; bullæ compressed, not extending below postglenoid process; steop basicranial axis; p 2 and P 3 crowded, unreduced; inferior border of ramus turns sharply downward below anterior part of M3 ; zygomatic arch narrow immediately in advance of the glenoid process, continuing forward and upward in a strong convexity on the side of face, more as in Eporeodon than in Promerycochoerus lacrymal fossæ deep but small; depth of malar below orbit, 29 mm.; hypocone of M3 noticeably smaller than protocone; internal cingulum on superior molars but faintly developed; transverse crests near together; very strong convexity above foramen magnum; crest of zygoma low and directly above glenoid process. Shape of the canine more like that of a carnivore than an herbivore.
C. B. Schultz and C. H. Falkenbach 1949SKULL: Larger, more massive, and broader than examples of M. cheeki; approximately equal in length to that of M. chelonyx wheeleri but broader; sagittal crest higher than in M. cheeki; frontals wide; malar deep below the orbit; zygomatic arch more massive and extending upward and posteriorly farther than in examples of M. cheeki,·lacrimal fossa larger than in examples of M. cheeki; infra- orbital foramen located above the posterior portion of pa and extending to the anterior portion of P 4 ; paroccipital process wide at base, and wider and tapering more rapidly than in examples of M. cheeki; bulla well nflated, comparatively large and suboval in outline, larger than in examples of M. cheeki; postglenoid process more robust and wider transversely than in examples of M. cheeki.
MANDIBLE: More massive than examples of M. cheeki.
DENTITION: Dental series longer and heavier than in examples of M. cheeki.
LIMBS: Longer and heavier than in M. cheeki
C. B. Schultz and C. H. Falkenbach 1954 (Desmatochoerus curvidens)SKULL: Medium size; approximate size of examples of D. hatcheri, smaller than in D. leiityi; anterior nasal-maxilla contact approximately above P 1 ; infraorbital foramen above posterior portion of P 8 ; muzzle narrower than in D. hatcheri; postglenoid process wide transversely, rounded in D. hatcheri.
MANDIBLE: Approximately same size as examples of D. hatcheri; postsymphysis below P2 (below P2 in D. hatcheri); inferior border of ramus with more abrupt downward curve posterior to M2 than usually found in this genus.
DENTITION: Series shorter than in D. leiityi, slightly shorter than in D. hatcheri.
LIMBS: (Unknown).