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.
Euoplocephalus had 9% of its genome completed during construction of the original park; implying that it was planned to be an attraction some time in the future.
According to the Dinosaur Protection Group, Euplocephalus was sometime before 2018. 
By the end of the InGen Incident there were only 9 that survived, the ones that did not most likely being killed by the escaped Tyrannosaurs and Velociraptors. ultimately the surviving Euoplocephalus were all killed by the Costa Rica Napalm Bombing that followed after the incident.
It is unknown if there were ever any populations that survived on Isla Sorna.
Euoplocephalus appears in the PSX/SEGA Saturn game The Lost World: Jurassic Park (video game) as the final boss 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 where you can then attack the dinosaur's belly.
Euoplocephalus can be created in the game.
Euoplocephalus can be created in the game. It was at first only purchasable in real-world money. Since September 30th 2016, it became a DNA tournament limited edition.
Euoplocephalus can be created in in Jurassic World: The Game. It is a super rare herbivore. Since September 30th, 2015, a fully maxed Euoplocephalus could be mixed with a fully maxed Giganotosaurus to make the hybrid Giganocephalus.
Euoplocephalus will be in Jurassic World: Alive.
A genetically advanced Euoplocephalus was planned for the toy line, but it was scrapped.