Summary:

- The article reports on the discovery of a new species of dinosaur, Meraxes gigas, which lived in what is now Argentina during the Late Cretaceous period, approximately 90 million years ago.

- Meraxes gigas was a carnivorous theropod dinosaur, closely related to the tyrannosaurids, and was one of the largest predators of its time, reaching up to 9 meters in length and weighing an estimated 4 tons.

- The discovery of Meraxes gigas provides new insights into the evolution and diversity of large carnivorous dinosaurs, and helps to fill a gap in the fossil record of South American theropods from the Late Cretaceous period.