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Brachycrus siouense

Mammalia - Merycoidodontidae

Taxonomy
Pronomotherium siouense was named by Sinclair (1915). Its type specimen is PU 12057, a mandible (right ramus of the lower jaw with p1-m3 and alveoli of i1-c.), and it is a 3D body fossil. Its type locality is Princeton Loc. 1000C, which is in a Barstovian terrestrial horizon in the Olcott Formation of Nebraska.

It was synonymized subjectively with Brachycrus laticeps by Kelly and Lander (1988); it was recombined as Brachycrus siouense by Schultz and Falkenbach (1940), Shotwell (1968), Lander (1998), Stevens and Stevens (2007) and Stevens et al. (2023).

Synonymy list
YearName and author
1915Pronomotherium siouense Sinclair p. 86
1937Pronomotherium siouense Thorpe p. 168 figs. Figs. 120-123
1940Brachycrus siouense Schultz and Falkenbach p. 232
1968Brachycrus siouense Shotwell
1998Brachycrus siouense Lander
2007Brachycrus siouense Stevens and Stevens p. 164
2023Brachycrus siouense Stevens et al. p. 108 figs. Figures 88-89; Appendix 11B; Table A37

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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()
speciessiouense()

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 siouense Sinclair 1915
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Diagnosis
ReferenceDiagnosis
M. S. Stevens et al. 2023Largest species of Brachycrus (M1-3 length = 105-165 mm; P2-M3 length = 103-126 mm; m1-3 length = 70- 95 mm; p2-m3 length = 103-135 mm), with the most pronounced sagittal crests, deepest nasal incision with the most curved dorsal border of the premaxilla and maxilla, and most upward-inclined nasal bones. The smallest specimens of B. siouense overlap with B. laticeps (Fig. 87), but most of the sample is much larger than B. laticeps.