English: Stegoceras novomexicanum is a pachycephalosaurid dinosaur that lived in what is now North America during the Late Cretaceous period. It is one of the most completely known pachycephalosaurs, and one of the few known from more than just the skull. Stegoceras was a small, bipedal dinosaur about 2-2.5 m long, and weighed around 10-40 kg. The skull was roughly triangular in shape with a short snout, and had a thick, broad, and relatively smooth dome on the top. Stegoceras had a thick shelf over the back of the skull, and a thick ridge over the eyes. Much of the skull was ornamented by round outgrowths and knobs, many in rows, and the largest formed small horns on the shelf.