Newly-discovered! 155 million-year-old dinosaur found in Utah leads to discover a great species of carnivorous dinosaur Allosaurus jimmadseni
A new species of carnivorous theropod dinosaur has been identified from the fossilized remains discovered in the 1990s in northeastern Utah and Wyoming, the United States. A group of Allosaurus jimmadseni attacks a juvenile sauropod dinosaur. Image credit: Todd Marshall. The newly-discovered dinosaur belongs to Allosauridae, a group of small to large-bodied, two-legged carnivorous dinosaurs that lived during the Jurassic and Cretaceous periods. Dubbed Allosaurus jimmadseni , the species inhabited the flood plains of western North America during the Jurassic period. The ancient creature was 8 to 9 m (26-29 feet) long and had a mass of around 1.8 metric tons. It had relatively long legs and tail, and long arms with three sharp claws. At 155 million years old, Allosaurus jimmadseni is the geologically-oldest species of Allosaurus predating the more well-known Allosaurus fragilis . The new species is distinguished by a number of unique features, including low crests ...