and more conservative proposals place it as a basal taxon within Ankylosauridae or even as a node close to Nodosauridae

Con garras afiladas como cuchillas

and Wyoming

Basilosaurs

Irritator challengeri Scale:1:35 and more conservative proposals placeIrritator challengeri is a species 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," referring 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