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Allosaurus (pronounced Al-oh-SAWR-us) Allosaurus, meaning "different lizard," was a huge, meat-eating dinosaur from the late Jurassic period, about 154 million to 144 million years ago. It was a theropod that lived in what is now the western United States. It was up to 40 feet long and weighed up to 4.5 tons. The skull was nearly 3 feet long and filled with dozens of serrated razor sharp teeth. It was about 10 feet tall at the hip and had 3 clawed fingers on its hands. The type species is Allosaurus fragilis and was first described by Marsh in 1877.