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Brachycrus siouense
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).
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
Year | Name and author |
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1915 | Pronomotherium siouense Sinclair p. 86 |
1937 | Pronomotherium siouense Thorpe p. 168 figs. Figs. 120-123 |
1940 | Brachycrus siouense Schultz and Falkenbach p. 232 |
1968 | Brachycrus siouense Shotwell |
1998 | Brachycrus siouense Lander |
2007 | Brachycrus siouense Stevens and Stevens p. 164 |
2023 | Brachycrus siouense Stevens et al. p. 108 figs. Figures 88-89; Appendix 11B; Table A37 |
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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
Reference | Diagnosis | |
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M. S. Stevens et al. 2023 | Largest 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. |