Ankylosaurus Magniventris Scute cast. Late Cretaceous, 68-66 MYA. Western North America. Sauropod. Herbivore. Ankylosaurus means "Fused Lizard". Magniventris means "Great Belly". Ankylosaurus was a heavily armoured dinosaur with a large powerful club on its tail. Ankylosaurus measured up to 6.25 m (20.5 feet). A scute is one of the hard, boney plates found on its back, much like on a turtles shell. Scute measures: 15 cm.