Styracosaurus was a dinosaur that lived in the Cretaceous Period about 75 million years ago. It had a single horn on its snout and at least eight horns on its neck frill. It was related to the later Triceratops. When it comes to Disney, it appeared in the film Dinosaur and its corresponding ride, DINOSAUR.
Styracosaurus appears in the herd that appears just after Aladar is chased by the Velociraptors. None of them talk, except for Eema.
Styracosaurus also appears in DINOSAUR at Disney's Animal Kingdom. It is the first dinosaur encountered. While the ride was called "Countdown to Extinction", a model of Styracosaurus was shown on the exterior.
Forrest Woodbush from The Good Dinosaur is a Styracosaurus. Oddly enough, however, he has the brow horns of a Triceratops as well as the nasal horn of a Styracosaurus.
In the original story for Dinosaur conceived and pitched by Phil Tippett and Paul Verhoeven in 1988, the main protagonist would have been a Styracosaurus (named Woot) and Aladar possibly would have taken the role of Eema.