Prehistoric sea reptiles

"Take a trip back in time to meet the giant reptiles that ruled the prehistoric seas! Get a closer look at the features of different groups, from the semiaquatic nothosaurs and the streamlined ichthyosaurs of the Triassic Period, to the ferocious plesiosaurs, pliosaurs and mosasaurs of the Jurassic and Cretaceous Periods"--Provided by publishers.