Placerias is an extinct genus of dicynodonts that lived during the late Carnian age of the Triassic Period million years ago). It was one of the largest herbivores in the Late Triassic, measuring up to metres ft) long and weighing up to a tonne.
Mamenchisaurus_adolescent.jpg (748×1700) - Réplique au Field Museum. Jurassique supérieur de Chine. Dinosauria, Saurischia, Sauropodomorpha, Sauropoda, Eusauropoda, Mamenchisauridae. Auteur : James St. John. 2005.
Amargasaurus, a Sauropod dinosaur from the early Cretaceous Period (around 130 million years ago). Amargasaurus was small for a Sauropod and featured two rows of spines down its neck and back. Photo taken in Victoria Museum, Melbourne, Australia.