Reptilia - Sauropterygia - Elasmosauridae

Parent taxon: Elasmosauridae according to R. B. J. Benson and P. S. Druckenmiller 2013

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

Subtaxa: Eromangasaurus australis, Eromangasaurus carinognathus

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Type: Eromangasaurus carinognathus

Ecology: aquatic carnivore