It also had a slight enlargement at the tip of its snout—called the premaxillary rosette—where larger teeth were concentrated

it has provided important insights into the morphology and defensive adaptations of early ankylosaurs

durante el período Devónico Tardío

approximately 73 to 65 million years ago

Its legs were robust and relatively long

Irritator challengeri cretácico It also had a slightIrritator 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