Reptilia - Sauropterygia

Synonym: Brachydeira Seeley 1892

Parent taxon: Plesiosauria according to H. F. Ketchum and R. B. J. Benson 2011

Sister taxa: Aptychodon, Embaphias, Eoplesiosaurus, Eretmosaurus, Gymocetus, Hexatarsostinus, Hunosaurus, Iserosaurus, Muraenosauridae, Namuncurania, Neoplesiosauria, Nothosaurops, Orophosaurus, Plesiosauroidea, Pliosauridae, Rhomaleosauridae, Scarrisaurus, Stratesaurus, Sulmosaurus, Taphrosaurus, Tremamesacleididae, Uronautes, Polyptychodon hudsoni, Polyptychodon interruptus

Subtaxa: Trinacromeridae

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Ecology: nektonic carnivore