Pachypleurosaurus

Pachypleurosaurus is a kind of prehistoric marine reptile belonging Nothosauroidea Pachypleurosauria that lived in the Middle Triassic of Europe, about 230 million years ago. The type species is P. edwardsi, the genus name means "thick ribs lizard. Pachypleurosaurus  belong Nothosauroidea is Plesiosauria, Placodontia  of kin. Highly specialized flippers different from the plesiosaurs, the nothosaurs like the palms, soles still similar terrestrial tetrapod. They may take the swing around the spine, to provide a force to move forward in the water.

