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Temporal range: Middle Jurassic
Proceratosaurus bradleyi by primevalraptor-d5p0k8v.png
An artist's illustration of Proceratosaurus bradleyi
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Order: Saurischia
Suborder: Theropoda
Superfamily: Tyrannosauroidea
Family: Proceratosauridae
Genus: Proceratosaurus
von Huene, 1926
Species: P. bradleyi
Binomial name
Proceratosaurus bradleyi
Woodward, 1910 [originally Megalosaurus]
  • Megalosaurus bradleyi (Woodward, 1910)

Proceratosaurus ("before Ceratosaurus") is a genus of small-sized (9.8 feet long) theropod dinosaur from the Middle Jurassic. It is a tyrannosauroid that fed on insects, lizards, mammals, and frogs. It lived in England. It has a small, pointed crest on its snout that looks similar to that of Ceratosaurus. It lived alongside other theropods, including Megalosaurus and Eustreptospondylus, sauropods, such as Cetiosaurus, stegosaurs, like Lexovisaurus, and ornithopods, like Callovosaurus and Camptosaurus.

Despite its size, Proceratosaurus was a fast and deadly carnivore. Its closet relatives are Chinese Guanlong and Russian Kileskus. It is almost impossible to believe that Proceratosaurus would evolve into giant, 43-foot long predators like Tyrannosaurus or Tarbosaurus.