Stegosaurus

Stegosaurus was a Stegosaur that lived in North America from 150 to 140 million years ago, during the Late Jurassic period. Stegosaurus was famous for the spikes on the end of its tail and the armored plates that ran along its back. The name Stegosaurus means 'Roofed' lizard. Its most famous specimens come from the Morrison Formation, in Colorado.

In Jurassic Park Films
While seen in The Lost World: Jurassic Park, and Jurassic Park III, the name "Stegasaurus" (A typo, obviously,) was seen next to a vile in the cold storage room in Jurassic Park.

In Jurassic Park Novel
In the first Jurassic Park film, there was a sick Triceratops that had eaten some poisonous West Indian Lilac berries and caused it to become very ill every 6 weeks. In the novel this was originally a sick Stegosaurus.

In Operation: Genesis
Stegosaurus was also in the game for PS2, PC, and Xbox, Jurassic Park: Operation Genesis, as a four-star attraction. Its fossils are found in the Morrison Formation, just like in the real world. It is based on it's appearance in Jurassic Park III.