Paleontologists in Argentina have identified a new species of dinosaur which likely had such feeble forearms, it would make Tyrannosaurus rex look like Popeye in comparison.
, which suggest abelisaurids were more diverse in South America than experts thought. As the southern supercontinent, Gondwana, began to split up, it seems abelisaurids were able to adapt to different isolated ecosystems., useless leftovers from ancestors who once benefited from their presence.
Nearly all the abelisaurid fossils found in Argentina so far have been from Patagonia and they share many physical similarities, including comically small arms. Butis the first to be found in the northwest, and its features are quite different, possibly reflecting life in a warmer climate. Its skull, for instance, shows a series of small holes that might have allowed the dinosaur to cool itself down by pumping blood to the skin's surface and releasing heat. Such a feature wouldn't be as useful further south.
"During the Late Cretaceous, South America was divided into northeastern and southwestern realms by a sea corridor which acted as a filter for some vertebrates," the authors
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