Sauropterygia n. pl. : Same as Plesiosauria.

Example:


Taxonomy
Sauropterygia, plesiosaurs, pliosaurs, free encyclopedia, neck, Superorder, Suborder Nothosauria, late Cretaceous, lizard, short-necked, ecological role, modifications, unranked, flipper, Origins, Extinction, aquatic environment, search.

Defination from the web:
Sauropterygia ("lizard flippers") is a group of very successful aquatic reptiles that flourished during the Age of the Dinosaurs before they became extinct. ... A review of the Sauropterygia. Adam Stuart Smith. The Plesiosaur Directory. Retrieved April 17, 2006. Paleofile taxalist ...