Of all the vexing fossil mysteries that have confounded paleontologists, few have been as persistent as that of Helicoprion – the name given to petrified whorls of elongate teeth that look like 270 ...

Reconstructing the anatomy of prehistoric sharks isn’t easy. With few exceptions – an exquisitely-preserved body fossil here, some calcified bits of skeleton there – teeth make up the majority of the ...

A 25ft monster 'shark' with chainsaw teeth that roamed the prehistoric seas 270 million years ago has been revealed by scientists. The bizarre fish Helicoprion, an early ancestor of sharks, had a ...

A rare fossil of a prehistoric monster-fish's spiral of chainsaw-like teeth has been found in Russia. The scary Helicoprion was an extinct ancestor of the modern-day ghost shark or ratfish with an ...

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