description Helicoprion bessonowi Overview
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 preserved jaw material shows that it occupied the lower jaw, where successive teeth formed a tightly coiled cutting structure.
help Helicoprion bessonowi FAQ
What was the tooth whorl of Helicoprion used for?
The spiral tooth whorl is now understood to have been located in the lower jaw, based on better-preserved specimens discovered in later decades. It is thought to have functioned as a slicing mechanism for processing soft-bodied prey like squid, rather than the bizarre external saw-like appendage depicted in older reconstructions.
When was Helicoprion first described and by whom?
Helicoprion bessonowi was named in 1899 by Russian paleontologist Alexander Karpinsky, who described it from fossilized spiral tooth whorls found in the Ural region of Russia. The unusual spiral teeth were so distinctive that their biological placement remained debated for over a century.
Is Helicoprion a type of shark?
Helicoprion was not a true shark but rather a eugeneodont, an extinct group of cartilaginous fish related to both modern sharks and chimaeras. It lived during the Permian period, before the age of dinosaurs and long before modern shark lineages diversified.
Where have Helicoprion fossils been found?
Helicoprion fossils—primarily the distinctive spiral tooth whorls—have been found in the Ural region of Russia as well as in North America, particularly in Idaho, and other Permian marine deposits. The Idaho specimens proved especially important in resolving the tooth whorl's position in the jaw.
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