Euoplocephalus

Euoplocephalus was an ankylosaurid Dinosaur from the Mid-Late Cretaceous of North America. This dinosaur weighed 2 tons and had a width of 2m and was around 6m long. Euoplocephalus was equipped with fused bone plates on its back that acted as body armor as well as a pair of horns that protruded from the back of the neck, possibly as a defense against being grabbed by the neck. For defense Euoplocephalus was armed with a foot wide tail club that could be swung like a medieval flail and had the ability to break bone. In addition Euoplocephalus also supported a pair of armored eyelids, like Ankylosaurus.

Jurassic Park Franchise
Euoplocephalus was listed as being in the park in the novel, but not ultimately seen in the books and films.

Jurassic Park novel
Euoplocephalus was listed as being in the park in the novel, but it is never encountered. There were 16 of them on the island at the start of the novel, living in Triceratops Territory with their distant cousins, the park's ceratopsians. It is shown that there are only nine left at the end of the novel. Presumably some were killed off by the tyrannosaurs and raptors.

The Lost World novel
Euoplocephalus are never seen or mentioned in the sequel to Jurassic Park, The Lost World. However, they might have died out due to their lack to reproduce, or just nesting in a different region of Isla Sorna.

Jurassic Park inspired games

 * Euoplocephalus appears in the PSX/SEGA Saturn game The Lost World: Jurassic Park (video game) as the final Euplacephalus.jpg in the series of the Velociraptor levels. The Euoplocephalus has three attacks, a charging attack, a lunging gore and a tail swipe. In addition to jumping onto the Euoplocephalus, it will cause you damage due to the horns on the back. To defeat the Euoplocephalus you need to pounce on its head and then lift the animal onto its side were you can then attack the dinosaur's belly.

Jurassic World: the Game
Euoplocephalus is a playable character in Jurassic World: The Game