helicoprion

Description:

the famous ancient shark with one of natures most wicked jaw apparatus. this shark possibly went through more reconstructions then any other shark. this due o it's odd, spiraled row of teeth. such teeth and mouth design has absolutely no analogue with out extant fauna, therefore scientist ere stumped on how this mouth would of operated.it was only fairly recently did we found out that it's teeth can spin backwards to a limited degree in a chainsaw like fashion. when prey is caught, such as this squid, the teeth would rotate backwards, sawing and sending the unfortunate prey item into it's throat.