Vertebrata - Sauropterygia - Elasmosauridae

Full reference: K. Carpenter. 1999. Revision of North American elasmosaurs from the Cretaceous of the Western Interior. Paludicola 2(2):148-173

Parent taxon: Elasmosauridae according to O. Hampe 2013

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

Subtaxa: Callawayasaurus colombiensis

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Ecology: aquatic carnivore