Mysterious prehistoric fish fossil could be extinct ancestor of ghost shark
A rare fossil of a prehistoric monster fish's spiral of chainsaw-like teeth found inside a Russian coal mine has surprised scientists. The Helicoprion is an extinct ancestor of our modern-day ghost shark or ratfish with a set of gigantic teeth. It used to live millions of years before the dinosaurs. The latest evidence of the cartilaginous fish proves the existence of fossilized arsenal of radial murder-teeth.