Helicoprion bessonowi is an extinct species of shark that lived during the Permian period, approximately 290 million years ago.
It is known for its unique spiral-shaped tooth whorl, which is often found as a fossilized impression. The tooth whorl was originally thought to be a circular saw-like structure located at the front of the animal's mouth, but it is now believed to have been located at the back of the jaw, similar to a modern shark's teeth.
The function of the tooth whorl is still a subject of debate among paleontologists, but it is thought to have been used for crushing and grinding prey, such as cephalopods and other marine invertebrates.
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