Plateosaurus

Plateosaurus engelhardti, whose name means 'broad lizard', was a large, herbivorous prosauropod dinosaur that roamed across what is now Europe during the Late Triassic period, approximately 214 to 204 million years ago. It was one of the first giant dinosaurs, reaching lengths of up to 10 meters (33 feet), though most individuals were smaller. Plateosaurus had a characteristically small skull on a long, flexible neck, a bulky body, and a long, mobile tail that served as a counterbalance. Its forelimbs were shorter than its hindlimbs and equipped with a large, sharp thumb claw, which may have been used for defense or for grasping vegetation. While capable of walking on all fours, analysis of its forelimb anatomy suggests it was primarily bipedal, using its powerful hind legs for locomotion. As an early sauropodomorph, Plateosaurus is a crucial transitional fossil, illustrating the evolutionary path towards the colossal sauropods of the Jurassic and Cretaceous, such as Brachiosaurus and Diplodocus. First described by Hermann von Meyer in 1837 based on fossils found in Germany, Plateosaurus is one of the best-known dinosaurs due to the abundance of fossil material recovered, including several 'bone beds' containing the remains of many individuals. These mass graves suggest it may have lived in herds and perhaps succumbed to environmental catastrophes like flash floods or droughts. Its study provides invaluable insights into the early diversification, physiology, and social behavior of dinosaurs.