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Desmatochoerus hatcheri

Mammalia - Merycoidodontidae

Taxonomy
Promerycochoerus hatcheri was named by Douglass (1907). Its type specimen is CM 1303, a skull (a nearly complete skull with the mandible), and it is a 3D body fossil.

It was recombined as Promerycochoerus hollandi hatcheri by Thorpe (1937); it was synonymized subjectively with Merycochoerus superbus by Lander (1998) and Tabrum and Nichols (2001); it was recombined as Desmatochoerus hatcheri by Schultz and Falkenbach (1954), Macdonald (1970) and Stevens et al. (2023).

Synonyms
Synonymy list
YearName and author
1907Promerycochoerus hatcheri Douglass p. 104 figs. Pl. 26
1930Promerycochoerus hesperus Stock
1932Promerycochoerus erythroceps Stock
1937Promerycochoerus erythroceps Thorpe p. 119 figs. PI. XV, figs. 1-3
1937Promerycochoerus hesperus Thorpe p. 123 fig. 80
1937Promerycochoerus hollandi hatcheri Thorpe p. 125 figs. Fig. 82; PI. XIV
1940Promerycochoerus thorpei Koerner
1949Mesoreodon hesperus Schultz and Falkenbach p. 151 fig. 20
1950Hypsiops erythroceps Schultz and Falkenbach p. 121 fig. 9
1954Desmatochoerus hatcheri Schultz and Falkenbach p. 186 fig. 6
1960Hypsiops erythroceps Stirton p. 361
1970Desmatochoerus hatcheri Macdonald
1989Mesoreodon hesperus Mason and Swisher
1996Desmatochoerus hesperus Stevens and Stevens
2023Desmatochoerus hatcheri Stevens et al. p. 60 figs. Figure 42C, 44A-E; Appendix 4B; Table A20

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Life
Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda
Reptiliomorpha
Anthracosauria
subclassAmphibiosauriaKuhn 1967
Cotylosauria()
Amniota
subclassSynapsida
Therapsida()
infraorderCynodontia()
Mammaliamorpha
RankNameAuthor
Mammaliaformes
classMammalia
Theriamorpha(Rowe 1993)
Theriiformes()
Trechnotheria
Cladotheria
Zatheria
subclassTribosphenida()
subclassTheria
Eutheria()
Placentalia
Boreoeutheria
Laurasiatheria
Scrotifera
Euungulata
Artiodactylamorpha
Artiodactyla()
familyMerycoidodontidae
subfamilyPromerycochoerinae
genusDesmatochoerus()
specieshatcheri()

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.

Desmatochoerus hatcheri Douglass 1907
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Invalid names: Promerycochoerus erythroceps Stock 1932 [synonym], Promerycochoerus hesperus Stock 1930 [synonym], Promerycochoerus thorpei Koerner 1940 [synonym]
Diagnosis
ReferenceDiagnosis
C. B. Schultz and C. H. Falkenbach 1949 (Mesoreodon hesperus)SKULL:Unknown.
MANDIBLE: Approximate size and construction of large examples of Mesoreodon megalodon; larger than in average examples of M. ckeeki.
DENTITION:Superior series unknown; inferior series similar to large examples of M. megalodon; P 3 with posterior intermediate crest.
LIMBS:Unknown.
C. B. Schultz and C. H. Falkenbach 1950 (Hypsiops erythroceps)SKULL: Larger (known from anterior portion of skull only) than other species of genus, approaching Promerycochoerus in size; nasals moderately heavy and pointed, anteriorly retracted to area above posterior portion of C/ (similar to the holotype of H. johndayensis); anterior nasal-maxilla contact above P 1.
MANDIBLE: Unknown.
DENTITION: p3 and P 4 with anterior intermediate crest (see discussion following). (Dentition incomplete and poorly preserved.)
LIMBS: Unknown.
C. B. Schultz and C. H. Falkenbach 1954SKULL: Approximately same size and characters as in D. curvidens; anterior nasal- maxilla contact above region of P 1 ; infra-orbital foramen above posterior portion of P8 to anterior portion of P4 ; facial vacuity present; muzzle slightly wider than in D. curvidens; postglenoid process rounded, as wide laterally as anteroposteriorly (differing from laterally compressed process in D. curvidens).
MANDIBLE: Approximately equal to that of D. curvidens; postsymphysis below P2.
DENTITION: Approximately equal in length to examples of D. hatcheri geringensis, tendency to be slightly smaller than in D. hatcheri niobrarensis, slightly larger than in D. curvidens and D. hatcheri grinnelli.
LIMBS:(Unknown).
M. S. Stevens et al. 2023Largest species of Desmatochoerus (M1-3 length = 63-79 mm).