Prehistoric 'Shark' Helicoprion Had Saw-Like Spiral Teeth
Description:It's a mystery that has puzzled paleontologists for a century, but scientists are now gaining a better understanding of a bizarre prehistoric fish called Helicoprion.
Researchers at Idaho State University led by Dr. Leif Tapanila published new findings concerning the appearance and evolutionary history of the long-extinct 25-foot predator in Biology Letters on Feb. 27.(3:06)