Proceratosaurus (Greek for "before Ceratosaurus"); pronounced PRO-seh-RAT-oh-SORE-us
Plains of Western Europe
Middle Jurassic (175 million years ago)
Size and Weight:
About 9 feet long and 500 pounds
Small size; narrow crest on snout
When its skull was first discovered--in England way back in 1910--Proceratosaurus was thought to have been related to the similarly crested Ceratosaurus, which lived much later. Today, though, paleontologists identify this middle-Jurassic predator as more similar to small, early theropods like Coelurus and Compsognathus. Despite its relatively small size, the 500-pound Proceratosaurus was one of the biggest hunters of its day, since the tyrannosaurs and other large theropods of the middle Jurassic had yet to attain their maximum sizes.