Cimoliasaurus

Cimoliasaurus was a plesiosaur that lived during the Late Cretaceous (Maastrichtian) of New Jersey.

Etymology
The name is derived from the Greek Κιμωλία kimolia, meaning "white chalk", and σαύρος sauros, meaning "lizard", in reference to the fact that the deposits in which it was found bear a superficial resemblance to the chalk deposits of the Western Interior Seaway.

Taxonomic history
The name Cimoliasaurus magnus was coined by Joseph Leidy for ANSP 9235, one anterior and 12 posterior cervical vertebrae collected in Maastrichtian-aged greensand deposits in Burlington County, New Jersey.

In his catalogue of plesiosaur and ichthyosaur specimens preserved in the NHM, the British zoologist Richard Lydekker referred several Jurassic and Cretaceous plesiosaur species to Cimoliasaurus, including the new species C. richardsoni (now considered a species of Cryptoclidus) and C. cantabrigiensis, as well as Colymbosaurus and a number of previously described species from the Cambridge Greensand and Chalk Group.

Nowadays, Cimoliasaurus is now recognized as being a derived elasmosaurid, effectively making the family name Cimoliasauridae Delair, 1959 a junior synonym of Elasmosauridae.

Misassigned nominal species

 * Cimoliasaurus laramiensis Knight, 1900, now Tatenectes
 * Cimoliasaurus richardsoni Lydekker, 1889, now Cryptoclidus richardsoni
 * Cimoliasaurus valdensis Lydekker, 1889, now Hastanectes
 * Cimoliasaurus teplicensis Fritsch, 1906 (nomen dubium)