Outwardly, Mesosaurus resembled a small alligator. It had a streamlined body, webbed feet (the hind limbs were longer than its front limbs, and probably its main means of propulsion), and a long tail with a fin. A typical Mesosaurus was about 16 inches (40 centimeters) long, but the largest animals were up to 6 feet (2 meters) long.
Mesosaurus most likely lived on a diet of fish, although another possibility is that it may have been able to use its teeth as sieve (as some modern whales do), and eaten small crustaceans.
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Mesosaurus was a marine reptile that lived between 320 and 280 million years ago
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