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Stirtonhyus xiphodonticus

Mammalia - Tayassuidae

Taxonomy
Prosthennops xiphodonticus was named by Barbour (1925) [also said to be 1924]. Its type locality is Valentine Railway Quarries, which is in a Barstovian terrestrial horizon in the Valentine Formation of Nebraska. It is the type species of Stirtonhyus.

It was recombined as Dyseohyus xiphodonticus by Voorhies (1990); it was recombined as Stirtonhyus xiphodonticus by Prothero (2021).

Synonyms
Synonymy list
YearName and author
1925Prosthennops xiphodonticus Barbour
1969Dyseohyus stirtoni Woodburne p. 325 figs. 3-4; Pl. 48-51
1983Prosthennops xiphodonticus Wright
1990Dyseohyus xiphodonticus Voorhies
1993Prosthennops xiphodonticus Wright
1998Prosthennops xiphodonticus Wright
2017Prosthennops xiphodonticus Dutra et al. p. 353
2021Stirtonhyus xiphodonticus Prothero p. 23

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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
—Mammaliaformes
RankNameAuthor
classMammalia
—Theriamorpha(Rowe 1993)
—Theriiformes()
—Trechnotheria
—Cladotheria
—Zatheria
subclassTribosphenida()
subclassTheria
—Eutheria()
—Placentalia
—Boreoeutheria
—Laurasiatheria
—Scrotifera
—Euungulata
—Artiodactylamorpha
—Artiodactyla()
superfamilySuoidea
—Suina(Gray 1868)
familyTayassuidae
subfamilyTayassuinaePalmer 1897
genusStirtonhyus
speciesxiphodonticus()

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.

†Stirtonhyus xiphodonticus Barbour 1925
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Invalid names: Dyseohyus stirtoni Woodburne 1969 [synonym]
Diagnosis
ReferenceDiagnosis
M. O. Woodburne 1969 (Dyseohyus stirtoni)Differing from D. fricki in the following ways: dorsal surface of nasals transversely convex; posterior palatine foramina opposite anterior half or posterior half of M1; palate extending posteriorly nearly to level of glenoid fossa, parametacone of P4 relatively well separated; molars relatively elongate and narrow, M3 elongate; dP3 and dP4 larger than in D. fricki; dP4 regularly rectangular; P4 large, relatively robust; lower molars relatively elongate; no genial spine on posterior surface of symphysis; ventral surface of symphysis concave below canines.