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. 1875. The Vertebrata of the Cretaceous formations of the west. Report of the United States Geological and Geographical Survey of the Territories 2:1-303
DOI ↗