Giant meat-eating dinosaur had a fancy skull and wee arms like T. rex FossilFriday
A newfound species of carnivorous dinosaur had disproportionately small arms, suggesting that this particular anatomical quirk — shared by the mighty but flimsy-armed Tyrannosaurus rex — may have been more common among large predatory dinosaurs than previously thought.
Canale and his colleagues dug through several tons of sandstone to reach the fossil, he told Live Science in an email. The study authors suspect that when the dinosaur died, its remains were rapidly covered by sediments carried by flowing water, which protected the body from decay. Related: Massive bulldog-faced dinosaur was like a T. rex on steroids
But not all large theropods had tiny arms. Some had long forelimbs, such as the ornithomimosaur Deinocheirus and the bird-like theropod Gigantoraptor. This hints that forelimb reduction was not simply related to body size in theropods. Rather, it tracks to some other trait in large predatory theropod species — likely skull size, the study authors reported.
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