A 170-million-year-old ancient marine reptile's fossils have revealed that the animal from the Age of Dinosaurs is the oldest-known mega-predatory pliosaur.
Pliosaurs were close relatives of plesiosaurs, and were ancient reptiles that lived in oceans.
Plesiosaurs are first appeared on Earth 170 million years ago, and were highly skilled swimmers.
The organism had jaws more than 1.3 metres long with large conical teeth.