Macrogryphosaurus was an Iguanodontid dinosaur from Argentina, and it lived in the Early Cretaceous Period. Its length is probably 6 or 7 metres.
Macrogryphosaurus didn't appear in the main series of Walking with Dinosaurs.
Macrogryphosaurus appear in Chased By Dinosaurs, where they are referred to as a species of Iguanodon. In Episode 1 they are seen running from Giganotosaurus, and also, a dead one is seen being eaten by a Giganotosaurus, demonstrably held aloft in the massive jaws of Giganotosaurus.