Reptilia - Sauropterygia - Elasmosauridae

Full reference: S. P. Welles. 1943. Elasmosaurid plesiosaurs with description of new material from California and Colorado. Memoirs of the University of California 13:125-254

Parent taxon: Elasmosauridae according to G. W. Storrs 1999

Sister taxa: Albertonectes, Alexeyisaurus, Alzadasaurinae, Aristonectinae, Callawayasaurus, Callowayosaurus, Cimoliasaurus, Elasmosaurinae, Elasmosaurus, Eromangasaurus, Hydrotherosaurus, Leurospondylus, Libonectes, Mauisaurus, Scanisaurus, Stereosaurus, Styxosaurus, Terminonatator, Thalassiosaurus, Thalassomedon, Thalassonomosaurus, Tuarangisaurus, Wapuskanectes, Zarafasaura, Morturneria

Subtaxa: Hydralmosaurus serpentinus

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Ecology: aquatic carnivore