A new pachycephalosaurid skull (Ornithischia) from the Cretaceous Hell Creek Formation of Montana

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Abstract
The new genus and species Stenotholus kohleri from the Late Cretaceous Hell Creek Formation of McCone County, Montana is a pachycephalosaurid omithischian. The species possesses a vertically high and transversely narrow dome, elimination of the parietosquamosal shelf, closure of the supratemporal fenestra in the subadult, a highly sculptured frontal, and a sagittally shortened occipital region. The possibility that this skull represents a previously described pachycephalosaurid is rejected on the basis of the unique suite of traits presented.