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Pachycephalosaurus wyomingensis, the first found pachycephalosaur, is used in 1931. It had a huge domed skull one to specific paleontologists ideal is accustomed butt thoughts in the dominance screens. Stygimoloch spinifer (meaning “horned devil from the lake of dying”) was first explained inside the 1983 together with an inferior, narrower dome and you may menacing surges protruding on the right back of the lead.