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Temporal range: Upper Jurassic
Ceratosaurus NT.jpg
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Sauropsida
Superorder: Dinosauria
Order: Saurischia
Suborder: Theropoda
Infraorder: Ceratosauria
Family: Ceratosauridae
Genus: Ceratosaurus
Marsh, 1884
  • 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 had a large horn on its nose, and a pair of smaller horns in front of its eyes. Uniquely among theropods, Ceratosaurus had armor, in the form of small osteoderms running down the middle of its back.