Invalid subtaxa: Cimoliasaurus limnophilus Koken 1887 [nomen dubium], Cimoliosaurus limnophilus Koken 1887 [nomen dubium], Plesiosaurus limnophilus Koken 1887 [nomen dubium]
Parent taxon: Plesiosauria according to R. B. J. Benson and P. S. Druckenmiller 2013
Sister taxa: Aptychodon, Embaphias, Eoplesiosaurus, Eretmosaurus, Gymocetus, Hexatarsostinus, Hunosaurus, Iserosaurus, Muraenosauridae, Namuncurania, Neoplesiosauria, Nothosaurops, Orophosaurus, Pliosauridae, Pliosauroidea, Rhomaleosauridae, Scarrisaurus, Stratesaurus, Sulmosaurus, Taphrosaurus, Tremamesacleididae, Uronautes, Polyptychodon hudsoni, Polyptychodon interruptus
Subtaxa: Cryptoclidia, Euplesiosauria, Microcleididae, Opallionectes, Plesiopterys, Plesiosauridae, Plesiosaurus, Sthenarosaurus, Westphaliasaurus
Ecology: aquatic carnivore