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†Styxosaurus Welles, 1943 †Alzadasaurus †Thalassiosaurus †Thalassonomosaurus †Styxosaurus snowii (Williston, 1890) Welles, 1943 †Alzadasaurus kansasensis †Alzadasaurus pembertoni †Thalassiosaurus ischiadicus †Thalassonomosaurus marshi †Styxosaurus browni Welles, 1952 [is now jr. synon. of †Hydralmosaurus serpentinus (Cope, 1877) Welles, 1943 sensu O'Keefe, 2001] [Treated as a valid species of genus Styxosaurus by Sato, 2003]
O'Keefe, F. R., 2001: A cladistic analysis and taxonomic revision of the Plesiosauria (Reptilia: Sauropterygia).
–Acta Zoologica Fennica: Vol. #213, pp. 1-63
Sato, T., 2003: Terminonatator ponteixensis, a new elasmosaur (Reptilia: Sauropterygia) from the Upper Cretaceous of Saskatchewan.
–Journal of Vertebrate Paleontology: Vol. 23, #1, pp. 89-103
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