Temnodontosaurus

Temnodontosaurus was an ichthyosaur from the Early Jurassic, some 198 and 185 million years ago (Hettangian - Toarcian), in Europe (England & Germany). It was a large genus, exceeded 12 meters (30 ft) in length.

Palaeobiology
Temnodontosaurus eyes were approximately 20 cm (8 in) in diameter making them the largest of any known vertebrate. They were powerful swimmers with great stamina and could descend into the deepest areas in the Jurassic sea to catch their prey.