ヘテロドントサウルス Heterodontosaurus オーストラリア恐竜大陸
世界共通発音: ヘッツアロドントソーラス het-ur-oh-dont-oh-saw-rus
命名意味: Differnt-toothed Lizard
Ornithischia / Genaria / Cerapoda
/ Family: Heterodontosauridae
First Described: 1962 / Foud: Africa: South Africa
/ Length: 1.2m / Weight: 9kg
/ Food: Plants / Young: Eggs
/ Lived: Early Jurassic 150－146 mya
Heterodontosaurus is one of the earliest ornithischian, or bird-hipped, dinosaurs. It is known from a complete skeleton and parts of a jaw. The skull is unique and has three types of teeth. The front teeth were sharp and used for cutting and snipping, whereas those at the back were broader and flatter and were used to grind tough vegetation before it was swallowed. These back teeth had a thick coat of enamel which would have prevented them from wearing out quickly. The third kind of teeth were tusk-like, resembling the canines of a dog.
Scientists think that Heterodontosaurus probably had fleshy cheeks or 'pouches', which were used to hold extra food. As the animal ground up some food with its teeth, the muscular cheeks would help by pushing the food from side to side to produce a chewing action.
We are not sure what the canine teeth were used for but they may have allowed Heteradontosourus to dig up roots. It ran on its two strong back legs and had well developed arms.