One of the strangest sharks that ever lived, Stethacanthus was nicknamed the Ironing-board Shark for its strange dorsal fin. The fin was flat on top and thick, and it was the shape of, well, an ironing board.
Stethacanthus was seven to nine feet long, and would have been dwarfed by today’s sharks. It was a small Devonian predator, and it lived 416-419 million years ago. At the time, only arthropods lived on land at the time, and most life lived in the sea. The Ironing-board Shark was more likely prey than predator.
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