Cymbospondylus

Cymbospondylus was a prehistoric sea monster from the Triassic Period. It was about six metres long, and made an appearance in Sea Monsters: A Walking with Dinosaurs Trilogy

More on Cymbospondylus - Cymbospondylus on Wikipedia

Jurassic Park franchise
Cymbospondylus doesn't appear in any movies or novels.

Jurassic Park inspired games
Cymbospondylus is number 112 of the Carnivore Threes that can be created in Jurassic Park III: Park Builder.