Pachycephalosauridae fossil rib bone.
Specimen measures approx 14.5" x 1.25"
With stand measures 15.25"
Pachycephalosaurus is a genus of pachycephalosaurid dinosaurs. The type species, P. wyomingensis, is the only known species. It lived during the Late Cretaceous Period of what is now North America. Remains have been excavated in Montana, South Dakota, Wyoming and Alberta.
Lived: 72.1 million years ago - 66 million years ago
Mass: 66 – 2,200 lbs
Length: 15 ft.
Higher classification: Pachycephalosauridae
Scientific name: Pachycephalosaurus (Thick-headed lizard)
Order: Ornithischian dinosaurs
Like other pachycephalosaurids, Pachycephalosaurus was a bipedal herbivore with an extremely thick skull roof. It possessed long hindlimbs and small forelimbs. Pachycephalosaurus is the largest-known pachycephalosaur. The thick skull domes of Pachycephalosaurus and related genera gave rise to the hypothesis that pachycephalosaurs used their skulls in intra-species combat. This hypothesis has been disputed in recent years.