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Stegomastodon nebrascensis

Mammalia - Proboscidea - Gomphotheriidae

Taxonomy
Stegomastodon nebrascensis was named by Osborn (1924) [from "Snake Creek, Sioux County... collected in the river drift of the Snake Creek horizon" and therefore possibly (but probably) not Stegomastodon but a Miocene proboscidean]. Its type specimen is Amer. Mus. 18240, a tooth (right inferior molar, r.M1), and it is a 3D body fossil. Its type locality is Aphelops Draw Quarries, which is in a Hemphillian terrestrial horizon in the Snake Creek Formation of Nebraska.

Synonymy list
YearName and author
1924Stegomastodon nebrascensis Osborn p. 5
1933Stegomastodon nebrascensis Frick p. 626 figs. Figure 29

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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()
RankNameAuthor
infraorderCynodontia()
—Mammaliamorpha
—Mammaliaformes
classMammalia
—Cladotheria
—Zatheria
subclassTribosphenida()
subclassTheria
—Eutheria()
—Placentalia
superorderAfrotheria
—Paenungulatomorpha
superorderPaenungulata
—Tethytheria
orderProboscidea()
familyGomphotheriidaeHay 1922
genusStegomastodonPohlig 1912
speciesnebrascensis

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.

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Diagnosis
No diagnoses are available
Measurements
No measurements are available
Composition: phosphaticsubp
Environment: terrestrialsubc
Locomotion: actively mobilec
Life habit: ground dwellingg
Diet: grazerg
Reproduction: viviparoussubc
Created: 2005-08-31 15:17:17
Modified: 2005-08-31 17:17:17
Source: g = genus, subc = subclass, c = class, subp = subphylum
References: Ji et al. 2002, Lillegraven 1979, Lambert and Shoshani 1998, Carroll 1988, Hendy et al. 2009

Age range: Hemphillian or 9.40000 to 4.70000 Ma

Collections: one only


Time interval Ma Country or state Original ID and collection number
Hemphillian9.4 - 4.7USA (Nebraska) Stegomastodon nebrascensis (type locality: 18033)