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Stibarus quadricuspis

Mammalia - Leptochoeridae

Taxonomy
Leptochoerus quadricuspis was named by Hatcher (1901). It is not extant. Its type specimen is CM 100. Its type locality is Warbonnet Creek (Orellan), which is in an Orellan terrestrial horizon in the Brule Formation of Nebraska.

It was recombined as Nanochoerus quadricuspis by Macdonald (1955); it was recombined as Stibarus quadricuspis by Matthew (1903), Matthew (1909), Cook (1912), O'Harra (1920), Hay (1930), Cook and Cook (1933), Edwards (1976) and Theodor et al. (2007).

Synonyms
Synonymy list
YearName and author
1901Leptochoerus quadricuspis Hatcher
1903Stibarus quadricuspis Matthew
1909Stibarus quadricuspis Matthew
1912Stibarus quadricuspis Cook
1920Stibarus quadricuspis O'Harra
1930Stibarus quadricuspis Hay
1933Stibarus quadricuspis Cook and Cook
1940Stibarus loomisi Scott
1955Nanochoerus quadricuspis Macdonald
1976Stibarus quadricuspis Edwards p. 101
2007Stibarus quadricuspis Theodor et al. p. 55

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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()
superfamilyDichobunoideaGill 1872
familyLeptochoeridae
genusStibarus
speciesquadricuspis(Hatcher 1901)

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.

†Stibarus quadricuspis Hatcher 1901
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Invalid names: Stibarus loomisi Scott 1940 [synonym]
Diagnosis
ReferenceDiagnosis
P. Edwards 1976Stibams quadricuspis is more robust than S. obtusilobus; the hypocone is moderately-to well-developed on the upper molars, unlike the weakly developed hypocones on the upper molars of s:obtusilobus. The lingual apex of the triangular upper molars is more blunt than in S. obtusilobus.