This is a .45" tooth from an indeterminate ankylosaur. It was collected from the Two Medicine Formation in Montana. Not enough diagnostic material has been uncovered and studied from this formation for identification down to the species level. The tooth is well preserved with minimal wear. Comes in an acrylic display case.
An artists reconstruction of an Ankylosaur. Image Public Domain by Mariana Ruiz
Ankylosaurs were herbivorous dinosaurs that lived during the Cretaceous and evolved complete body armor covered in plates, scutes and spikes. They wielded a massive tail club which could have been used to defensive purposes against predators such as Tyrannosaurs. Adult Ankylosaurs are believed to have reached up to 25 feet in length.