Pachycephalosaurus


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Pachycephalosaurus

(păk'ĭsĕf'əlōsôr`əs) [Gr., = thick-headed lizard], bipedal herbivorous dinosaurdinosaur
[Gr., = terrible lizard], extinct land reptile of the Mesozoic era. The dinosaurs, which were egg-laying animals, ranged in length from 2 1-2 ft (91 cm) to about 127 ft (39 m).
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 of the late Cretaceous period, approximately 68–65 million years ago. Its distinguishing characteristic was a very heavy dome-shaped skull that was up to 10 in. (25 cm) thick; the skull was covered with bumps. Because the top vertebrae were able to lock in place, scientists have theorized that the head was used as a battering ram, perhaps to establish dominance within a herd. The mouth was beaked and the jaws held leaf-shaped cheek teeth. The eyes were placed in a way that made it capable of binocular vision, and Pachycephalosaurus is believed to have had an acute sense of smell. Because of a dearth of skeletal specimens, other characteristics of this genus can be surmised only from related dinosaurs. Fossils have been found in Montana, South Dakota, and Wyoming. Pachycephalosaurus, along with Stygimoloch and Homalocephale, belongs to the group of ornithischian dinosaurs called pachycephalosaurs, or bone-headed dinosaurs.
References in periodicals archive ?
Bones from Pachycephalosaurus were dense and canal-free, suggesting that it was an adult.
Caption: Three different dinosaurs--Dracorex, Stygimoloch and Pachycephalosaurus (clockwise from top left)--might actually be the juvenile, teen and adult of the same dino.Credit: Holly Woodward
Other items for sale include the world's only known skeleton of the dinosaur Pachycephalosaurus wyomingensis and the only postcard from the Titanic.
NEW dinosaurs for the sequel include an adult and baby stegosaurus, a pachycephalosaurus and blood-thirsty "compies" - procompsognathus triassicus to give them their correct title - prehistoric chickens from Hell.
The pachycephalosaurus was a bird-hipped dinosaur with a thick dome- shaped skull to protect its brains during routine head-butting
Then it's time to watch part of an autopsy on a female Pachycephalosaurus and to watch a Triceratops hatching.
The new dinosaur will be a lab experiment by the geneticists and according to the producers it will be "bigger, louder and with more teeth." The confirmed dinosaurs featuring in the movie include the Tyrannosaurus Rex, Velociraptors, Triceratops, Gallimimus, Pachycephalosaurus