Giganotosaurus ( or meaning "giant southern lizard") is a genus of carcharodontosaurid dinosaurs that lived in what is now Argentina during the early Cenomanian age of the Late Cretaceous Period, approximately some 99.6 to 97 million years ago. It included some of the largest known terrestrial carnivores, with known individuals equaling or slightly bigger than the size of the largest of the genera Tyrannosaurus and Carcharodontosaurus, but not as large as those of Spinosaurus.