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Brachycrus laticeps

Mammalia - Merycoidodontidae

Taxonomy
Merycochoerus laticeps was named by Douglass (1900). Its type specimen is CM796, a partial skeleton (a nearly complete skull and lower jaw with some other bone fragments), and it is a 3D body fossil.

It was recombined as Pronomotherium laticeps by Douglass (1907) and Thorpe (1937); it was recombined as Brachycrus laticeps by Schultz and Falkenbach (1940), Kelly and Lander (1988), Lander (1998), Tabrum and Nichols (2001), Stevens and Stevens (2007) and Stevens et al. (2023).

Subspecies

Synonyms
Synonymy list
YearName and author
1900Merycochoerus laticeps Douglass p. 428 figs. 1 - 3
1901Merycochoerus altiramus Douglass p. 73 fig. 1
1901Merycochoerus madisonius Douglass p. 75 fig. 2
1901Merycochoerus elrodi Douglass p. 78 fig. 3
1902Merycochoerus laticeps Hay p. 668
1907Pronomotherium altiramum Douglass
1907Pronomotherium madisonium Douglass
1907Pronomotherium laticeps Douglass p. 94
1907Pronomotherium altiramus Douglass p. 97
1909Pronomotherium altiramus Matthew
1919Merycochoerus buwaldi Merriam
1924Pronomotherium altiramus Thorpe
1925Pronomotherium altiramus Thorpe
1937Merycochoerus buwaldi Thorpe p. 152 figs. Fig. 112
1937Pronomotherium altiramus Thorpe p. 161 figs. Figs. 4, 114-116
1937Pronomotherium elrodi Thorpe p. 164 figs. Fig. 117; PI. XXIV, fig. 4
1937Pronomotherium laticeps Thorpe p. 165 figs. Fig. 118; PI. XXIV, figs. 1-3
1937Pronomotherium madisonium Thorpe p. 167 figs. Fig. 119; PI. XXIV, fig. 5
1940Brachycrus sweetwaterensis Schultz and Falkenbach
1940Brachycrus buwaldi Schultz and Falkenbach p. 223
1940Brachycrus buwaldi barstowensis Schultz and Falkenbach p. 227
1940Brachycrus altiramus Schultz and Falkenbach p. 228
1940Brachycrus elrodi Schultz and Falkenbach p. 229
1940Brachycrus madisonius Schultz and Falkenbach p. 230
1940Brachycrus laticeps Schultz and Falkenbach p. 231
1940Brachycrus wilsoni Schultz and Falkenbach p. 242
1940Brachycrus wilsoni longensis Schultz and Falkenbach p. 247 fig. 9
1940Brachycrus sweetwaterensis Schultz and Falkenbach p. 250
1940Brachycrus vaughani Schultz and Falkenbach p. 252
1954Desmatochoerus newchicagoensis Schultz and Falkenbach p. 192 figs. 5, 7
1968Brachycrus buwaldi Schultz and Falkenbach
1968Brachycrus vaughani rioosoensis Schultz and Falkenbach p. 367 figs. Figure 46
1968Brachycrus laticeps mooki Schultz and Falkenbach p. 369 figs. Figure 46
1988Brachycrus laticeps Kelly and Lander
1998Brachycrus buwaldi Lander
1998Brachycrus laticeps Lander
2001Brachycrus laticeps Tabrum and Nichols
2007Brachycrus laticeps Stevens and Stevens p. 164
2007Brachycrus wilsoni Stevens and Stevens p. 164
2023Brachycrus laticeps Stevens et al. p. 108 figs. Figures 90-94; Appendix 11C; Table A38

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
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
subfamilyBrachycrurinae
genusBrachycrus()
specieslaticeps()

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.

Brachycrus laticeps Douglass 1900
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Invalid names: Brachycrus buwaldi barstowensis Schultz and Falkenbach 1940 [synonym], Brachycrus laticeps mooki Schultz and Falkenbach 1968 [invalid subgroup], Brachycrus sweetwaterensis Schultz and Falkenbach 1940 [synonym], Brachycrus vaughani Schultz and Falkenbach 1940 [synonym], Brachycrus vaughani rioosoensis Schultz and Falkenbach 1968 [synonym], Brachycrus wilsoni Schultz and Falkenbach 1940 [synonym], Brachycrus wilsoni longensis Schultz and Falkenbach 1940 [synonym], Desmatochoerus newchicagoensis Schultz and Falkenbach 1954 [synonym], Merycochoerus altiramus Douglass 1901 [synonym], Merycochoerus buwaldi Merriam 1919 [synonym], Merycochoerus elrodi Douglass 1901 [synonym], Merycochoerus madisonius Douglass 1901 [synonym]
Diagnosis
ReferenceDiagnosis
C. B. Schultz and C. H. Falkenbach 1954 (Desmatochoerus newchicagoensis)SKULL: Moderately large, larger than in other species of genus, but not so large as examples of Superdesmatochoerus; brain case long, inflated more than usual in genus; frontals wide with the usual midline protuberance of genus; nasals comparatively long and narrow; orbits small; malar deep below orbit; paroccipital process with less anterior twist to shaft than in other species of genus. (Bulla unknown.)
MANDIBLE: Similar to examples of D. hatcheri niobrarensis; postsymphysis below P2.
DENTITION: Inferior premolars lighter and more laterally compressed than in other species of genus. (Superior series unknown.)
LIMBS:(Unknown).
M. S. Stevens et al. 2023Medium-sized species of Brachycrus (M1-3 length = 60-90 mm; P2-M3 length = 100-140 mm) with slightly less robust sagittal crest, zygomatic arches, and snout region compared to B. siouense. Smallest individuals of B. siouense overlap in size with this species. Larger and more robust than B. rusticus