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. 1876. On some extinct reptiles and Batrachia from the Judith River and Fox Hills Beds of Montana. Proceedings of the Academy of Natural Sciences of Philadelphia 28:340-359