representing 43% of the known tetrapod species in the region

Length 69 mm

Altura 53 mm

Height 99 mm

Snout-tail length 305 mm

Irritator challengeri Seymouria representing 43% of the knownIrritator challengeri is a genus of spinosaurid theropod dinosaur that lived during the Early Cretaceous Period, approximately 110 million years ago, in what is now Brazil. Its name comes from the Latin "irritator", in reference to the frustration of paleontologists upon discovering that the original fossil had been altered with plaster by the collectors who found it, and "challengeri" in honor of Professor Challenger, a fictional character created by