Ceratosaurus

Ceratosaurus Temporal range: Upper Jurassic 161.2–145 mya
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Sauropsida
Superorder:	Dinosauria
Order:	Saurischia
Suborder:	Theropoda
Infraorder:	Ceratosauria
Family:	†Ceratosauridae
Genus:	†Ceratosaurus Marsh, 1884
Species
C. nasicornis (type) Marsh, 1884 C. ingens (Janensch, 1920) C. dentisulcatus Madsen & Wells, 2000 C. magnicornis Madsen & Wells, 2000

Ceratosaurus was a predatory dinosaur from the Upper Jurassic period, 156 to 145 million years ago.

It was first described by O.C. Marsh in 1884. It had a horn on its nose, and a pair of small horns above its eyes. Unusually, for a theropod, Ceratosaurus had armour: small osteoderms ran down the middle of its back.

The animal had deep jaws and long blade-like teeth. A nearly complete skeleton was discovered in Garden Park, Colorado, in rocks belonging to the Morrison Formation.

Other examples or close relatives have since been found.