Pistosaurus

Pistosaurus is a genus of that lived in Europe during the Middle Triassic. Pistosaurs could reach a length of 3 metres (10 ft). It was closely related to Plesiosaurs.

More real-life information: Pistosaurus at Wikipedia.

Jurassic Park Franchise
Pistosaurus is nr. 121 of the Carnivore Twos that can be created in Jurassic Park III: Park Builder.