Eurysaurus

Eurysaurus (meaning "wide lizard") is an extinct genus of plesiosaur, originally classed as a nothosaur, from the Early Jurassic of Echenoz-la-Meline, France, named in 1878. The type material, consisting of a cranium, teeth and five vertebrae, is now lost. The type species is "E. raincourti", and a second species, "E. schafferi", was named in 1924 but it has since been absorbed into the unrelated genus "Germanosaurus".
History.
The holotype, first described in 1878 by Albert Gaudry, has since been lost. A new study based essentially on illustrations of the type material by Noah (2001) has considered "Eurysaurus" a "nomen dubium", probably congeneric with the pliosaur "Simolestes". However, due to the stratigraphic difference of the two forms, it is possible that "Eurysaurus" was a separate genus in its own right.
Classification.
Gaudry in 1878 originally classified "Eurysaurus" as a nothosaur. In 2001, Noah reclassified "Eurysaurus" as a plesiosaur, possibly belonging to the Pliosauroidea.