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Stethacanthus2
Stethacanthus was a shark that lived 385–320 million years ago during late Devonian and early Carboniferous periods. It was about 70 centimetres (2.3 ft) long, and in many respects, looked like a typical shark. However, it is best known for its unusually shaped dorsal fin, which resembled an anvil or ironing board.
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