Plesiosaurus zetlandicus (nomen dubium)
Diagnosis
A Rhomaleosaurus with a more robust and relatively shorter and wider skull, and a steeper profile of the lower jaw symphysis when compared with Rhomalosaurus megacephalus (Stutchbury). Tooth ornament coarse, with widely-spaced ridges and reducing in number towards the tip, triangular in section. Palatal foramina and internal nares he in the same groove, as opposed to the condition in R. megacephalus. The length-width ratio of the snout is 1:1 as opposed to 1.25:1 for R. megacephalus.