An ancient sea predator had a spiraling whorl of teeth that acted as a lethal slicing tool, according to new scans of a mysterious fossil. Helicoprion was a bizarre creature that went extinct some 225 ...

A study in the Journal of Morphology shows how the bizarre prehistoric ratfish called a Helicoprion ate with its unique set of choppers. A Helicoprion was a prehistoric ratfish that featured perhaps ...

Long before dinosaurs ruled the land, the oceans were already terrifying. Helicoprion and its relatives evolved a jaw unlike anything seen before or since. A spiraling blade of teeth sat inside the ...