‘Very weird’ ankylosaur’s tail looked like an Aztec war club


The newly described ankylosaur Stegouros elengassen displays its weaponized tail. (Image credit: Gabriel Diaz Yantén)

Paleontologists in subantarctic Chile have discovered the remains of a “very weird” ankylosaur that had a deadly armored tail like no other known dinosaur, the researchers said.

“The tail would have looked like a sword; it’s so flat,” study co-lead researcher Alexander Vargas, a vertebrate paleontologist in the Department of Biology at the University of Chile, told Live Science. It would have looked “a bit like an Aztec sword, or the Aztec club called the macuahuitl.”