Helicoprion is a long-lived genus of extinct, shark-like eugeneodontid holocephalid fish. Almost all fossil specimens are of spirally arranged clusters of the individuals' teeth, called "tooth whorls"— the cartilaginous skull, spine, and other structural elements have not been preserved in the fossil record, leaving scientists to make educated guesses as to its anatomy and behavior.Helicoprion first arose in the oceans of the early Permian[2] 290 million years ago, survived the Permian–Triassic extinction event, and eventually became extinct during the Early Triassic,250 million years ago. Its name is Greek for "spiral saw". The closest living relatives of Helicoprion (and other eugeneodontids) are the chimaeras.


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