(pronounced sim-FEHR-oh-fus) Symphyrophus meaning fused roof) is a doubtful genus of dinosaur; it is probably Camptosaurus, a plant-eater from the late Jurassic period (about 156 million to 145 million years ago) that looked a lot like Iguanodon . It was a heavy ornithischian dinosaur that was about 16-23 feet (5-7 m) long. It had a long snout, hun...