Unearthed fossils from a carnivorous dinosaur that lived in Argentina about 90 million years ago show that it had tiny arms compared to its body, scientists said on Wednesday.

The team of scientists said the two-legged dinosaur was from 6 to 8 meters long but its puny pair of arms only measured about 60 cm, or about the size of a human child. It was a Theropod like other meat-eating dinosaurs including the Tyrannosaurus rex.

"Something totally new has been discovered, a new lineage that we didn't know of before," Argentine paleontologist Sebastian Apesteguia said at a news conference in Buenos Aires after the team published it conclusions in the PLOS ONE journal.