 Because Iguanodon is one of the first dinosaur genera to have been named , numerous species have been assigned to it . While never becoming the <unk> taxon several other early genera of dinosaurs became ( such as Megalosaurus ) , Iguanodon has had a complicated history , and its taxonomy continues to undergo revisions . Although Gregory Paul recommended <unk> I. bernissartensis to the famous sample from Bernissart , ornithopod workers like Norman and McDonald have disagreed with Paul 's recommendations , except exercising caution when accepting records of Iguanodon from France and Spain as valid . 
