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Class: Synapsida
except for some octopi
it was more basal ("primitive") than true crown-tetrapods
indicating that this was a display structure that became larger and more well developed as individuals reached maturity
Pachycephalosaurus Model Ankylosaurus Class: SynapsidaPachycephalosaurus 1 35 Scale Polyresin Model. Pachycephalosaurus was a dome headed dinosaur. Its huge head housed an incredibly thick skull, a tiny brain, and large eyes. Its rounded skull was up to 10 inches thick. Pachycephalosaurus grew to be about 15 feet long and may have weighed roughly 950 pounds. Pachycephalosaurus probably had a good sense of smell. It had bumpy knobs on its snout and along the rear of its skull. This plant eater had short