The Ultimate Dinosaur Wiki

Ceratosaurus was a medium-sized Late Jurassic theropod. It would have lived alongside Stegosaurus and Allosaurus.

Fact File

Length: 6 metres

Height: 2 metres

Weight: 500kg

Diet: Carnivorous


Ceratosaurus means 'Horned Lizard', referring to the horn on its nose, and possibly the two bumps above the eyes. None of these horns are actually strong enough to be used in offense or defence, so their purpose is a mystery. It was perhaps a sign of sexual maturity, or a mating device.



Unlike most theropods, Ceratosaurus had a row of armoured scutes (osteoderms) running the length of its spine. Due to their position, they probably weren't actually used for defence.


Ceratosaurus' tail was thin and flexible, and comprised of up to half the body length. The osteoderms on its spine did continue on the tail.

Ceratosaurus species

  • C. dentisulcatus
  • C. ingens
  • C. magnicornis
  • C. meriani
  • C. nasicornis

    Ceratosaurus nasicornis

  • C. stechowi