Megalosaurus is a genus of mid sized theropod from Europe. Although, fossilshave been reported in every continent except Antarctica, the only valid fossils come from England. It was similar to the larger Allosaurus, and Tyrannosaurus.
Megalosaurus was the first dinosaur described. It was named in 1825. Although, Rutellum was named before it, it is not considered a part of biological nomenclature.