Basic info Taxonomic history Classification Included Taxa
Morphology Ecology and taphonomy External Literature Search Age range and collections

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), Stevens et al. (2023).

Synonymy list
YearName and author
1915Pronomotherium siouense Sinclair p. 86 fig. 11
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

Is something missing? Join the Paleobiology Database and enter the data

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()
RankNameAuthor
—Mammaliamorpha
—Mammaliaformes
classMammalia
—Cladotheria
—Zatheria
subclassTribosphenida()
subclassTheria
—Eutheria()
—Placentalia
—Boreoeutheria
—Laurasiatheria
—Scrotifera
—Euungulata
—Artiodactylamorpha
—Artiodactyla()
suborderTylopoda()
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
show all | hide all
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.
Measurements
No measurements are available
Composition: phosphaticsubp
Environment: terrestrialo
Locomotion: actively mobilec
Life habit: ground dwellingf
Diet: herbivoref
Reproduction: viviparoussubc
Created: 2005-08-31 14:37:21
Modified: 2005-08-31 16:37:21
Source: f = family, o = order, subc = subclass, c = class, subp = subphylum
References: Hendy et al. 2009, Lander 1998, Lillegraven 1979, Nowak 1999, Carroll 1988

Age range: base of the Hemingfordian to the top of the Early/Lower Barstovian or 18.50000 to 12.50000 Ma

Collections (14 total)


Time interval Ma Country or state Original ID and collection number
Hemingfordian18.5 - 16.3USA (Nebraska) Brachycrus siouense (17959 17990)
Early/Lower Barstovian16.3 - 12.5USA (New Mexico) Brachycrus laticeps (19547)
Early/Lower Barstovian16.3 - 12.5USA (Nebraska) Brachycrus laticeps (18019) Brachycrus siouense (17905 17911 17919 17955 17976 type locality: 17983 17995 17996 18004 18011)