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ALL ABOUT SHARKS! | |
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Sharks have existed for over 350 million years. They evolved over 100 million years before the dinosaurs did. This was long before people evolved. Most fossil evidence of early sharks is from fossilized teeth and a few skin impressions. Cladodonts, primitive sharks, had double-pointed teeth, were up to 6 feet (2 m) long, ate fish and crustaceans, and lived about 360 million years ago (mya).
The earliest-known primtitive shark remains are fossil "scales" that date from about 420 million years ago, during the early Silurian. The earliest shark genera are Mongolepis, Polymerolepis, and Palaeospondylus.
Other early sharks included Orthacanthus, Hybodus and Megalodon. Modern forms of sharks evolved during the Jurassic period, about 150 mya; this was the time of the giant dinosaurs like Brachiosaurus.
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