Location : Argentina, South America

This medium-sized meat-eater was a South American cousin of Allosaurus  It was found in the same area as Patagosaurus  and probably fed upon those large plant-eaters when they were still young (and small).

Piatnitzkysaurus seems to have been a more primitive allosaurid in a number of its features. It is considered by some to be a "root" dinosaur at the base of the carnosaur family tree. This family tree, however, is not yet universally accepted.