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Prehistoric ghost shark Helicoprion’s spiral-toothed jaw explained


After a century of colourful guesses, CT scans have revealed what’s really going on inside the nightmarish jaw of Helicoprion, a large, 270 million-year-old cartilaginous fish with an elaborate whorl of teeth set in the middle of its mouth. In 1899, Russian geologist, Alexander Petrovich Karpinsky, gave this six-metre-long fish the name Helicoprion, meaning “spiral [...]

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The Hypnotic Whorl of Teeth That Keeps Researchers Guessing


How many facelifts can one extinct animal undergo? The answer is probably equal to the number of interested researchers and paleoartists out there, and then some. In the case of the mysterious whorled tooth rows left behind by the fossil fish known as Helicoprion, artist Ray Troll has documented close to two dozen, many of [...]

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