Basic info Taxonomic history Classification Relationships
Morphology Ecology and taphonomy External Literature Search Age range and collections

Styxosaurus snowii

Reptilia - Sauropterygia - Elasmosauridae

Taxonomy
Cimoliasaurus snowii was named by Williston (1890). Its type specimen is KUVP 1301, a partial skeleton (a skull and 28 cervical vertebrae), and it is a 3D body fossil. Its type locality is Hell Creek, which is in a Campanian marine horizon in the Niobrara Formation of Kansas. It is the type species of Styxosaurus.

It was recombined as Elasmosaurus snowii by Williston (1906); it was considered a nomen vanum by Welles (1962); it was recombined as Styxosaurus snowii by Welles (1943), Welles (1949), Storrs (1999), Carpenter (1999) and O'Keefe (2001).

Synonyms
Synonymy list
YearName and author
1890Cimoliasaurus snowii Williston
1903Cimoliasaurus snowii Williston p. 7
1906Elasmosaurus snowii Williston p. 229 figs. 2-3
1943Styxosaurus snowii Welles
1949Styxosaurus snowii Welles
1949Alzadasaurus pembertoni Welles and Bump p. 524 figs. 3-5
1962Alzadasaurus pembertoni Welles pp. 3 & 66 fig. 15
1999Styxosaurus snowii Carpenter p. 158
1999Styxosaurus snowii Storrs p. 7
2001Styxosaurus snowii O'Keefe p. 15

Is something missing? Join the Paleobiology Database and enter the data

RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
RankNameAuthor
Amniota
Sauropsida
classReptilia
subclassEureptilia()
Romeriida
Diapsida()
orderSauropterygia
Pistosauria(Baur 1890)
Plesiosauria(de Blainville 1835)
superfamilyPlesiosauroideaWelles 1943
Cryptoclidia
Xenopsaria
familyElasmosauridaeCope 1869
subfamilyStyxosaurinae
genusStyxosaurus
speciessnowii()

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
S. P. Welles and J. D. Bump 1949 (Alzadasaurus pembertoni)"Related to A. riggsi, but with more expanded ventral plates and narrower dorsal processes of scapulae; coracoids shorter along midline suture and much more expanded posteriorly: ischia longer and with narrower posterior ends; epipodials relatively shorter compared to humerus and absolutely smaller."