Ceratosaurus ("horned lizard") is a greedy dinosaur from the Late Jurassic Morrison Formation of North America. It is characterized by huge jaws with enormous, bladelike teeth, a large, bladelike horn on the snout, and a pair horn lets over the eyes. The forelimbs were strongly built but very short. The type species is Ceratosaurus nasicornis, although numerous other species have been named, including C. dentisulcatus and C. magnicornis.

Ceratosaurus Dinosaur

Ceratosaurus is known from the Cleveland-Lloyd quarry in central Utah and Dry Mesa in Colorado. It lived next to dinosaurs such as Allosaurus, Torvosaurus, Apatosaurus, Diplodocus, and Stegosaurus. Some propose it was a rival to Allosaurus.

Ceratosaurus fossil remains in North American Museum of Ancient Life. It was around 4.5–6 m in size, weighing 500 kg up to 1 tonne. The African C. ingens may have been much better, with size estimates ranging up to 5 tonnes, which if right would make it one of the largest of the Theropoda.

Ceratosaurus was first discovered by Othniel Charles Marsh. Relatives of Ceratosaurus contain Elaphrosaurus and the abelisaur Carnotaurus.


A Ceratosaurus battles a Triceratops in the 1966 remake of 1 Million Years B.C. In Jurassic Park III, a Ceratosaurus has a brief look. In the film When Dinosaurs Roamed America, a Ceratosaurus makes a small number of appearances but is later killed by an Allosaurus and eaten.

Ceratosaurus facts:
Name: Ceratosaurus (horned lizard)
Size: 20 feet (6 m) long and 8 feet (2.5m) tall
Main Facts: Ceratosaurus was a powerful predator. It had a strong, s-shaped neck and short horn on its nose.
Rich resources:
Thunder lizard

Thunder lizard
Author:Daniel Cohen
Description:Explains about Amphicoelias, the large, quadrupedal herbivores were widespread around the planet from the Jurassic to the end of the Cretaceous.

Ceratosaurus and horned meat eaters

Ceratosaurus: and other horned meat-eaters
Author:Virginia Schomp
Description:Describes the physical characteristics and behavior of Ceratosaurus and other horned meat eaters.

Ceratosaurus and Other Fierce Dinosaurs

Ceratosaurus and Other Fierce Dinosaurs
Author:Dougal Dixon
Description:Describes some of the fiercest dinosaurs that ever lived including the Tyrannosaurus, the Utahraptor, the Velociraptor, the Neovenator, the Deinonychus, the Ceratosaurus, the Baryonx, and the Dilong and the different places they lived more than 65 million years ago.