This taxon is considered subjective synonym of
of the valid taxon Plesiosauroidea
according to the Paleobiology Database.
See the page for Plesiosauroidea →
Bibliography
Original description
H. G. Seeley. 1892. The Nature of the Shoulder Girdle and Clavicular Arch in Sauropterygia. Proceedings of the Royal Society of London 51:119-151