Stegouros elengassen, new dino species

beware the tail

Look: This dinosaur had a natural weapon unlike any other

Lethal.

Mauricio Álvarez

Esther van Hulsen/Stocktrek Images/Stocktrek Images/Getty Images

Ankylosaurs are known for their full-body armor and massive, club-like tails.

Their distant cousins, stegosaurs, were studded with armored plates and had deadly spiked tails called thagomizers.

JUSTIN TALLIS/AFP/Getty Images