Allosaurus is a genus of large theropod dinosaurs that lived 155 to 145 million years ago, in the late Jurassic period (Kimmeridgian to Tithonian). The name Allosaurus means "different lizard". The first remains that can definitely be ascribed to this genus were described in 1877 by Othniel Charles Marsh. As one of the first well-known theropod dinosaurs, it has long attracted attention outside of paleontological circles. It has also been a lead dinosaur in several films and documentaries.
- Skull Length: 84cm (33in)
Origin: North America