A pachycephalosaurid is a member of the Pachycephalosauridae, a clade of ornithischian dinosaurs.
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.
The longest dinosaur name is Micropachycephalosaurus which is 23 letters long.(pronounced MY-cro-PACK-ee-SEF-ah-lo-SAWR-us)The Micropachycephalosaurus (meaning "tiny thick-headed lizard") was a very small pachycephalosaurid, a thick-skulled, plant-eating ornithischian dinosaur. It was about 1.5-3 feet (0.5-1 m) long and weighed roughly 22-33 pounds (10-15 kg). It lived during the late Cretaceous period, about 83 to 73 million years ago. Its fossils have been found in China; only a very incomplete specimen has been found.The Micropachycephalosaurus was named in 1978 by the Chinese paleontologist Dong. The type species is M. hongtuyanensis.
bracheasaurus. They can reach to about to 5 storys high! brachiasaurus (brak-ee-a sor us) are very common dinosaurs. they are not attractive to movement and arent vicous lie other speices. they are about 30 feet long from head to tail. they have very long necks