>>32542929There actually is! Many creatures have long, sharp, backwards-facing teeth in order to easily snag slippery fish. So naturally, the only step up from that is to have a backwards-facing lower jaw. Although, it must have been extremely specialized to eat whatever it ate to have such a strange adaptation.
And no, it was not merely just ONE shark; multiple tooth whorls of multiple species of Helicoprion have been found
Also, it turns out that this pic I posted
>>32542243 is outdated. Sorry. Pic related should be a more accurate depiction; the tooth whorl being further back in the lower jaw. I hope.
>>32542815this guy gets it
