A skull from the Middle Jurassic of England apparently displays a nasal horn similar to that of "Ceratosaurus". In 1926, Friedrich von Huene described this skull as "Proceratosaurus" (meaning "before "Ceratosaurus""), assuming that it was an antecedent of the Late Jurassic "Ceratosaurus". Today, "Proceratosaurus" is considered a basal member of the Tyrannosauroidea, a much more derived clade of theropod dinosaurs; the nasal horn therefore would have had evolved independently in both genera. Oliver Rauhut and colleagues, in 2010, grouped "Proceratosaurus" within its own family, the Proceratosauridae. These authors also noted that the nasal horn is incompletely preserved, opening the possibility that it represented the foremost portion of a more extensive head crest, as seen in some other proceratosaurids such as "Guanlong".