Allosaurus (pronounced /ˌæləˈsɔrəs/) is a genus of large theropod dinosaur that lives in the Rainy Basin and the Blackwood Flats. The name Allosaurus means "different lizard" and is derived from the Greek αλλος/allos ("different, strange") and σαυρος/sauros ("lizard"). They are one of several large carnivorous species inhabiting Dinotopia.
Allosaurus is a large bipedal predator with a large skull, equipped with dozens of large, sharp teeth. It averages 8.5 meters (30 ft) in length. Relative to the large and powerful hindlimbs, its three-fingered forelimbs are small, and the body is balanced by a long, heavy tail. It is classified as an allosaurid, a type of carnosaurian theropod dinosaur.
Allosaurus inhabit the Blackwood Flats of Dinotopia's south, sharing their habitat with Red-faced Tyrannosaurus.