Today, the cryptodires (left) are the more diverse of the two turtle lineages and, except for the polar regions, are found worldwide. They live in marine, near shore, lake, river, wet forest, and desert habitats and include such familiar beasts as snapping, box, and sea turtles.

The heyday of the pleurodires (right), many of which were seagoing, was in the Cretaceous and early Tertiary, more than 60 million years ago. Today, pleurodires live in freshwater habitats in Africa, Australia, and South America.

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