When dinosaurs roamed the Earth, lesser known but equally fearsome creatures commanded the sea. Naish takes readers for a dive into prehistoric waters, in order to discover extraordinary sea creatures who reigned supreme in the ocean for 150 million years. You'll discover apex predators, evolutionary anomalies, survivors of extinction events, and scientific theories and contentions that have arisen in the complex history of sea reptile research.

Evolution -- Anatomy -- The lesser-known groups: mesosaurs, Triassic sauropterygians, Cretaceous sea snakes and more -- Shark-shaped reptiles: the ichthyosaurs and their kin -- Long necks, big mouths: the plesiosaurs -- Sea crocs: the thalattosuchians -- Mosasaurs: the great sea lizards -- Sea turtles