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

suggesting that it spent most of its time on dry land

limbs modified into flippers

Length 94mm

It was formally described by Buckley et al

Lythronax argestes Mammuthus Its arms were relatively longLythronax 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