T. rex lookalike suggests that tiny arms developed for a purpose

NS dino

While Tyrannosaurus rex was stalking prey some 68 million years ago in what is now North America, down south an unrelated predator was trying out a similar look.

A new dinosaur species, Gualicho shinyae, unearthed in Argentina’s Huincul formation bears a mosaic of features and looks a bit like an Allosaurus, a subgroup of two-legged, bird-like theropods. Its most striking feature, however, is its tiny arms that look like those of a T. rex — even though the two species lived on separate continents.

The Huincul formation is renowned for remarkable dinosaur fossils, including Argentinosaurus – perhaps the largest dinosaur ever. But nothing quite like Gualicho had ever been found here.

“Gualicho has anatomical traits that you see in very disparate groups of theropod dinosaurs,” says Pete Makovicky of The Field Museum in Chicago, who described this “mosaic” dinosaur. “It appears to be closest to Allosaurus, but it doesn’t quite fit comfortably.”

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