Allosaurus is a genus of carnivorous theropod dinosaur that lived 155 to 150 million years ago during the late Jurassic period (Kimmeridgian to early Tithonian[3]). The name "Allosaurus" means "different lizard" alluding to its unique concave vertebrae. It is derived from the Greek and σαῦρος/sauros ("lizard / generic reptile"). The first fossil remains that could definitively be ascribed to this genus were described in 1877 by paleontologist Othniel Charles Marsh. As one of the first well-known theropod dinosaurs, it has long attracted attention outside of paleontological circles. Indeed, it has been a top feature in several films and documentaries about prehistoric life.

Range North America and Europe
Scientific Classification
Kingdom Animalia
Order Saurischia
Family Allosauridae
Genus Allosaurus
Conservation Status

Speed: 19 – 34 mph

Lived: 163.5 million years ago - 89.3 million years ago (Late Jurassic - Turonian)

Family: †Allosauridae

Fossils: AMNH 680, Big Al Two, USNM 8367, Big Al, USNM 4734

Eats: Stegosaurus, DryosaurusDiplodocusCamptosaurus

Did you know: It measured about 8 meters (about 26 ft) in length.

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