Eocarcharia dinops, or ''fierce-eyed dawn shark,'' was armed with three-inch (7.6-centimeter), blade-like teeth, likely for disabling and dismembering prey. Some experts speculate that its menacing brow was used in head-butting contests with rival males.
Kryptops palaois, or ''old hidden face,'' boasted a horny face that may have had a special role.
"From the texture of the [skull] bone, it seems like they almost have a bill on the front of their face for sticking their head in and gnawing away at carcasses," said Paul Sereno. The University of Chicago paleontologist co-authored the new study on the species, which appears in the latest issue of the journal Acta Palaeontologica Polonica.
Source: National Geographic