Description of the lower jaw of Stegosaurus (Reptilia, Ornithischia)

Abstract

Description ofa well preserved lower jaw of Stegosaurus reveals previously unknown structural details. Although comparisons between the lower jaw of Stegosaurus and those of other stegosaurs are greatly limited, they strongly suggest a close comformity. The lower jaw of Stegosaurus exhibits the most primitive grade of organization among the ornithischians with one noticeable exception, the retention of an intercoronoid in ceratopsians.