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. A new plesiosaur from the Niobrara Cretaceous of Kansas. Transactions of the Kansas Academy of Science 12:174-178

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

See also Carpenter 1999, Storrs 1999, Welles 1949, Welles 1962, Welles and Bump 1949, Williston 1903 and Williston 1906

Sister taxa: Hydralmosaurus serpentinus, Styxosaurus browni, Thalassonomosaurus marshii

Type specimens:

  • Styxosaurus snowii: KUVP 1301, a partial skeleton (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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