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.` Helicoprion first arose in the oceans of the late Carboniferous {Ma|310}, survived the Permian–Triassic extinction event, and eventually becam......
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http://en.wikipedia.org/wiki/Helicoprion
Helicoprion was an ancient fish from the Late Paleozoic (it appeared during the Carboniferous period, about 345 million years ago). This predatory fish is known only from fossilized teeth; it probably had a cartilaginous body (which does not fossilized well and is possibly why a fossil skeleton from this fish has not been found). Helicoprion was pr...
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http://www.enchantedlearning.com/subjects/dinosaurs/glossary/
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