Edestus giganteus by Dinoraul ()
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Edestus is a genus of shark that lived throughout the world's oceans during the late Carboniferous. All of the species are known only from their teeth. They did not shed the teeth as they became worn. Rather, it continued growing new teeth and gums near the back of the mouth, eventually pushing the older teeth and gums forward, until they protruded from the mouth. All of the species are presumed to have been carnivorous. Exactly how they captured, or even ate, their prey, remains pure speculation. Edestus giganteus was up to 6 meters ( 19,6 feet ) long.