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Styxosaurus snowii Williston 1890

Styxosaurus

PaleoDB taxon number: 100111

Alternative combinations: Cimoliasaurus snowii, Elasmosaurus snowii

Synonym: Alzadasaurus pembertoni Welles and Bump 1949 (taxon 114170)

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

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.