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Temporal range: Upper Cretaceous
|Skull of Pachycephalosaurus at the Oxford University Museum of Natural History.|
P. wyomingensis (Gilmore, 1931) (type)
This member of the Pachycephalosaurid family is known from a single skull and a few thick skull roofs. From this it is estimated that its length was about 4.5 to 5 metres long (about 15 feet).
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