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Halisaurus sternbergi

Reptilia - Squamata - Mosasauridae

Taxonomy
Clidastes sternbergi was named by Wiman (1920). Its type specimen is UPI R 163, a partial skeleton (A nearly complete skeleton), and it is a 3D body fossil. Its type locality is Bilby's Ranch, Beaver Creek, which is in a Santonian/Campanian marine chalk in the Niobrara Formation of Kansas. It is the type species of Eonatator.

It was recombined as Eonatator sternbergii by Bardet et al. (2005); it was recombined as Halisaurus sternbergi by Russell (1970), Thurmond and Jones (1981), Bardet and Pereda Suberbiola (2001), Lindgren and Siverson (2005) and Fanti et al. (2014).

Synonymy list
YearName and author
1920Clidastes sternbergi Wiman p. 13 figs. Figs. 4-9, Plates 3-4
1970Halisaurus sternbergi Russell p. 369
1981Halisaurus sternbergi Thurmond and Jones p. 155
2001Halisaurus sternbergi Bardet and Pereda Suberbiola
2005Eonatator sternbergii Bardet et al.
2005Halisaurus sternbergi Lindgren and Siverson
2014Halisaurus sternbergi Fanti et al.

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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
Sauropsida
classReptilia
subclassEureptilia()
Romeriida
Diapsida()
Eosuchia()
Neodiapsida
SauriaGauthier 1984
Lepidosauromorpha(Benton 1983)
superorderLepidosauria()
orderSquamata
Episquamata
ToxicoferaVidal and Hedges 2005
superfamilyMosasauria(Marsh 1880)
familyMosasauridae
genusHalisaurusMarsh 1869
speciessternbergi(Wiman 1920)

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
J. Lindgren and M. Siverson 2005Cervical and dorsal vertebrae very large relative to overall size of the animal. Marginal tooth-crowns small (up to 12.5 mm high), conical and subcircular in cross section. Carinae on marginal teeth inconspicuous. Enamel on marginal crowns thick at apex but very thin at base of crown. Surface of enamel either smooth or developed into faint, closely spaced, and undulating striations (particularly on the lingual face). Twenty-two teeth in dentary.