Marasuchus lilloensis

A Middle-to-Late Triassic dinosauriform from Argentina, Marasuchus was a small, slender animal usually found close to the origin of dinosaurs, without being a dinosaur itself. With their long forelimbs these basal dinosauriforms may have alternated between four-legged bounding and two-legged striding. Marasuchus lilloensis is sometimes sunk into Lagosuchus talampayensis, a dispute that remains unsettled.