This taxon is considered nomen vanum, species not entered
of the valid taxon Plesiosauria
according to the Paleobiology Database.
See the page for Plesiosauria →
Bibliography
Original description
E. D. Cope. 1894. On the structure of the skull in the plesiosaurian Reptilia, and on two new species from the Upper Cretaceous. Proceedings of the American Philosophical Society 33:109-113