Irritator is a genus of spinosaurid dinosaur that lived in what is now Brazil during the Albian stage of the Early Cretaceous Period, about 113 to 110 million years ago. It is known from a nearly complete skull found in the Romualdo Formation of the Araripe Basin. Martill and colleagues named the dinosaur Irritator as a tribute to “the feeling the authors felt (understated here) when discovering that the snout had been artificially elongated.”