Rugops is a large meat eating dinosaur that was featured largely in Monsters ressurected episode 1.
Rugops was first shown hunting and eating a Paralititan baby. Suddenly a Spinosaurus snatches the Rugops from the ground and kills it. From then on Rugops was shown being killed by Spinosaurus almost everywhere. It was not main again until the end when a pack of rugops attacked the Spinosaurus and killed it by breaking its sail.
Trivia
Rugops was said to be 30 feet long in MR and Spinosaurus at 60 feet. That ment that 2 Rugops would have equaled the length of Spinosaurus.However The Rugops were shown to be a 1/4 of the length of Spinosaurus. That meant that the Rugops were probably juveniles.