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Helicoprion is an extinct genus of shark-like cartilaginous fish that lived during the Permian period, first named in 1899. Belonging to the order Eugeneodontida, this marine predator is famous for its bizarre anatomical feature: a symphyseal tooth whorl arranged in a continuous spiral. Because thei...
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Helicoprion bessonowi was a Permian eugeneodont, an extinct cartilaginous fish related to sharks and chimaeras. Alexander Karpinsky named it in 1899 from a distinctive spiral arrangement of fossil teeth found in the Ural region of Russia. The position of this tooth whorl was debated for decades, but...
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