Scientists have identified a new species of ancient aquatic reptile that swam the seas when dinosaurs still ruled the Earth. Dubbed Umoonasaurus, the creature lived in waters off the coast of what is now Australia 115 million years ago, when the continent was located much closer to Antarctica than it is now. Plesiosaurs were large marine reptiles that had stocky, barrel-shaped bodies, short tails and paddle-like limbs. Some had long, slender necks, while others had short, squat ones. What made Umoonasaurus stand out from other plesiosaurs were a series of high, thin crests on its head and numerous fused vertebrae...