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Stibarus montanus

Osteichthyes - Leptochoeridae

Taxonomy
Stibarus montanus was named by Matthew (1903). Its type specimen is AMNH 9668, a mandible (a lower jaw containing the second, third, and fourth premolars, and the first molar), and it is a 3D body fossil. Its type locality is Pipestone Springs, which is in a Chadronian terrestrial claystone in the Renova Formation of Montana.

It was recombined as Nanochoerus montanus by Macdonald (1955).

Synonymy list
YearName and author
1903Stibarus montanus Matthew p. 219 figs. 12, 13
1940Stibarus montanus Scott p. 375
1955Nanochoerus montanus Macdonald
1976Stibarus montanus Edwards p. 102
2007Stibarus montanus Theodor et al. p. 55

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
classOsteichthyes
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()
superfamilyDichobunoideaGill 1872
familyLeptochoeridae
genusStibarus
speciesmontanus

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 montanus Matthew 1903
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Diagnosis
ReferenceDiagnosis
P. Edwards 1976Stibarus montanus is approximatcIy the same size, but slightly more robust than S. obtusilobus. ‘?S. montunus has a cingulum developed on the posterior end of the molars in contrast to S. obtusilubus which has a cingulum developed around the anterior end of the molars.
Measurements
No measurements are available
Composition: phosphaticsubp
Environment: terrestrialo
Locomotion: actively mobilec
Life habit: ground dwellingo
Diet: grazero
Diet 2: browsero
Reproduction: viviparoussubc
Created: 2005-08-26 14:03:05
Modified: 2005-09-19 12:23:23
Source: o = order, subc = subclass, c = class, subp = subphylum
References: Nowak 1999, Carroll 1988, Hendy et al. 2009, Lillegraven 1979

Age range: Chadronian or 37.00000 to 33.90000 Ma

Collections (6 total)


Time interval Ma Country or state Original ID and collection number
Chadronian37.0 - 33.9Canada (Saskatchewan) Stibarus montanus (16919)
Chadronian37.0 - 33.9USA (Montana) Stibarus montanus (16959 16988 type locality: 17010)
Chadronian37.0 - 33.9USA (North Dakota) Stibarus montanus (16991)
Middle Chadronian37.0 - 33.9Canada (Saskatchewan) Stibarus montanus (16928)