Styxosaurus snowii Williston 1890 (elasmosaur)

Reptilia - Sauropterygia - Elasmosauridae

Alternative combinations: Cimoliasaurus snowii, Elasmosaurus snowii

Synonym: Alzadasaurus pembertoni Welles and Bump 1949

Full reference: S. W. Williston. 1890. Structure of the plesiosaurian skull. Science 16(405):262

Belongs to Styxosaurus according to F. R. O'Keefe 2001

See also Carpenter 1999, Welles 1962 and Welles and Bump 1949

Sister taxa: Hydralmosaurus serpentinus, Styxosaurus browni, Thalassonomosaurus marshii

Type specimens:

  • Styxosaurus snowii: KUVP 1301, a skull (a skull and 28 cervical vertebrae). Its type locality is Hell Creek, which is in a Campanian marine horizon in the Niobrara Formation of Kansas.
  • Alzadasaurus pembertoni: SDSM 451, a skeleton. Its type locality is West bank of Missouri River near Bailey Island, which is in a Campanian/Campanian marine shale/shale in the Pierre Shale Formation of South Dakota.

Ecology: aquatic carnivore


• Cretaceous of United States (3: Kansas collections)

Total: 3 collections each including a single occurrence

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Specimen images are retrieved through the ePANDDA API.

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