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Sphenocoelus

Mammalia - Perissodactyla - Brontotheriidae

Synonyms
Synonymy list
YearName and author
1872Palaeosyops vallidens Cope
1891Palaeosyops vallidens Earle p. 111
1895Dolichorhinus Hatcher
1895Manteoceras vallidens Hatcher
1895Sphenocoelus Osborn
1895Telmatotherium vallidens Osborn
1895Sphenocoelus Osborn p. 98 figs. 12 - 15
1912Dolichorhinus Riggs p. 25
1914Dolichorhinus Osborn p. 405
1914Sphenocoelus Osborn p. 405
1926Tanyorhinus Cook
1929Dolichorhinus vallidens Osborn
1943Dolichorhinoides Granger and Gregory p. 363
1988Dolichorhinoides Carroll
1988Dolichorhinus Carroll
1988Sphenocoelus Carroll
1989Telmatherium vallidens Mader
1989Dolichorhinus Prothero and Schoch p. 536
1989Dolichorhinoides Prothero and Schoch p. 537
1989Sphenocoelus Prothero and Schoch p. 537
1998Sphenocoelus Mader p. 530
2008Sphenocoelus Mader p. 8
2008Dolichorhinus Mihlbachler p. 413
2008Sphenocoelus Mihlbachler p. 413

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
Amniota
RankNameAuthor
Synapsida()
Therapsida()
infraorderCynodontia()
Epicynodontia
infraorderEucynodontia
Probainognathia
Mammaliamorpha
Mammaliaformes
classMammalia
subclassTribosphenida()
infraclassEutheria()
Placentalia
orderPerissodactyla()
familyBrontotheriidae()
subfamilyDolichorhininae()
genusSphenocoelus

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.

Diagnosis
ReferenceDiagnosis
B. J. Mader 2008Medium to large sized (length P1 to M3 approximately 173–287 mm, length M1 to M3
approximately 101–173 mm) dolichorhinine brontothere with extremely long (hyperdolichocephalic) skull. The genus is also distinguished from other dolichorhinine brontotheres by a small, angular horn at the fronto- nasal boundary over the orbit and by a double suborbital protuberance in which there is a small anterior flange and a large posterior flange. The horn is weak or absent in at least some specimens of Sphenocoelus uintensis, however, and the anterior flange of the suborbital protuberance is weak or absent in certain specimens of S. uintensis and S. intermedius. The condition of the suborbital protuberance is not known with certainty in S. angustidens.