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Pachycephalosauria
Pachycephalosauria (Greek for 'thick headed lizards') is a clade of ornithischian dinosaurs. Candidates for the earliest known pachycephalosaur include Ferganocephale adenticulatum from the Middle Jurassic Period of what is now Kyrgyzstan and Stenopelix valdensis from the Early Cretaceous Period of what is now Germany, although Sullivan (2006) doubts that either of these species are pachycephalosaurs.
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