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Brachycrus rusticus

Mammalia - Merycoidodontidae

Taxonomy
Merycochoerus rusticus was named by Leidy (1870). Its type specimen is NM 145, a partial skull (Anterior portion of skull with I1(br.)-M2 (P4 br.) and partial mandible with i1-i2 alv. and i3(rt.)-m3(br.) (p1 br.)), and it is a 3D body fossil. It is the type species of Brachycrus, Merycochoerus (Brachycrus).

It was recombined as Merychyus rusticus by Scott (1890); it was recombined as Ticholeptus rusticus by Loomis (1920) and Thorpe (1937); it was recombined as Brachycrus rusticus by Palmer (1904), Schultz and Falkenbach (1940), Schultz and Falkenbach (1941), Kelly and Lander (1988), Munthe (1988), Lander (1998), Stevens and Stevens (2007) and Stevens et al. (2023).

Subspecies
B. riograndensis

Synonyms
Synonymy list
YearName and author
1870Merycochoerus rusticus Leidy p. 109
1873Merycochoerus rusticus Leidy p. 199
1884Merycochoerus rusticus Cope p. 535
1890Merychyus rusticus Scott
1902Merycochoerus rusticus Hay p. 668
1904Brachycrus rusticus Palmer
1920Ticholeptus rusticus Loomis
1924Merycochoerus rusticus Thorpe
1937Ticholeptus rusticus Thorpe p. 194 figs. Figs. 142-143; PI. XXVIII, figs. 1-2; PI. XLVII, fig. 1
1940Brachycrus rusticus Schultz and Falkenbach p. 247
1941Brachycrus rusticus Schultz and Falkenbach
1968Brachycrus rusticus riograndensis Schultz and Falkenbach p. 367 figs. Figure 44
1988Brachycrus rusticus Kelly and Lander
1988Brachycrus rusticus Munthe
1998Brachycrus rusticus Lander
2007Brachycrus rusticus Stevens and Stevens p. 164
2023Brachycrus rusticus Stevens et al. pp. 104 - 108 figs. Figures 85-87; Appendix 11A; Table A36

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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()
speciesrusticus()

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 rusticus Leidy 1870
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†Brachycrus rusticus riograndensis Schultz and Falkenbach 1968
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Diagnosis
ReferenceDiagnosis
M. S. Stevens et al. 2023Smallest species of Brachycrus (M1-3 length = 50-68 mm; P2-M3 length = 90-94 mm; m1-3 = 68-70 mm; p2- m3 = 95-100 mm) with slightly flatter dorsal profile than in other species of the genus, and less pronounced snout with smaller nasal region.