A head study of the advanced ceratosaur Ceratosaurus nasicornis. While not the largest theropod to live in North America in the late Jurassic, it is certainly one of the most interesting, particularly because of the unusual cranial ornamentation, which consisted of flat, blade-like horns over the eyes, and just behind the nostrils.

Head profile of the Jurassic predator Ceratosaurus magnicornis, a close relative of C. nasicornis. One very obvious diference betweeb the two is in the shape of the horns. These may have been used for intraspecific recognition.

Skull reconstruction of the Jurassic theropod Ceratosaurus magnicornis.

to the Jurassic.