It was discovered in 2006 in the Futaba Formation

Its arms were relatively long and ended in grasping hands with a modified thorn-like thumb

It was formally described by Buckley et al

with strong legs and an elongated neck and tail

suggesting that it spent most of its time on dry land

Lythronax argestes Mammuthus It was discovered in 2006Lythronax argestes was a carnivorous theropod dinosaur of the Tyrannosauridae group that lived during the Late Cretaceous , in the early middle Campanian (approximately 8079 million years ago) . Its remains come from the Wahweap Formation , in what is now southern Utah (United States) , within the ancient island continent of Laramidia , and its discovery has been key to understanding the origin and early diversification of tyrannosaurids in North