both male and female of this species are the same in coloration.

Stygimoloch. Although being classified as subadult pachycephalosaurus, the islands stygimoloch have been made into a separate species. These animals are very strange in appearance with the large spikes that  protrude from the back of their heads. Like the pachycephalosaurus and stegoceras this species possesses a dome on its head and like those species it is used for a similar purpose. All this makes the stygimoloch a very interesting dinosaur indeed.