The Liopleurodon was a fairly large marine carnivore,that lived in the Jurassic.
Liopleurodon, meaning 'smooth-sided teeth', is a genus of large, carnivorous marine reptile belonging to the Pliosauridea, a a clade of short-necked plesiosaurs. Two species of Liopleurodon lived during the Callovian stage of the Middle Jurassic Period (c. 160 to 155 mya), while the third, L. rossicus, lived during the Late Jurassic. It was the apex predator of the Middle to Late Jurassic seas that covered Europe.
This animal can be downloaded in the Formidable Seas UCI pack, and is based on its appearance in Walking with Dinosaurs and Chased by Sea Monsters.