The State Dinosaur Hypsibema missouriense is a type of dinosaur called a Hadrosaur or "duck billed" dinosaur. It was a herbivore with jaws that contained over 1,000 teeth. Hypsibema had evolved specialized teeth to handle the tough, fibrous vegetation of the time. Hypsibema lived in Missouri during the Late Cretaceous Period. Hypsibema was first discovered in 1942 by Dan Stewart, near the town of Glen Allen, MO, and became the state's official dinosaur on July 9, 2004.