Styxosaurus

Styxosaurus
Temporal range: Late Cretaceous,
Holotype skull of Styxosaurus snowii
Scientific classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Superorder: †Sauropterygia
Order: †Plesiosauria
Family: †Elasmosauridae
Subfamily: †Elasmosaurinae
Genus: †Styxosaurus
Welles, 1943
Species
  • †S. snowii (Williston, 1890; type)
  • †S. browni Welles, 1952
  • †S. rezaci Smith & O'Keefe, 2023
Synonyms
  • Cimoliasaurus snowii Williston, 1890
  • Elasmosaurus snowii (Williston, 1890)
  • Ogmodirus ischiadicus Williston & Moodie, 1903/1913
  • Thalassonomosaurus marshi (Williston, 1906) Welles, 1943 [originally Elasmosaurus]
  • Alzadasaurus pembertonii Welles & Bump, 1949
  • Alzadasaurus kansasensis Welles, 1952

Styxosaurus is a genus of plesiosaur of the family Elasmosauridae. Styxosaurus lived during the Campanian age of the Cretaceous period. Three species are known: S. snowii, S. browni, and S. rezaci.

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