出典:Wikipedia
出典:『Wikipedia』 (2011/06/30 06:51 UTC 版)
Ornatotholus is a genus of pachycephalosaur dinosaur from the Late Cretaceous of southern Alberta. It was the only known North American pachycephalosaur with a flat skull roof until the discovery of Dracorex in South Dakota. Ornatotholus appears to share many similarities with Stegoceras and may represent a juvenile form, making it a nomen dubium.