Megatooth shark
The extinct family Otodontidae — the giant, serrated megatooth sharks of the genus Otodus whose lineage culminated in megalodon.
A megatooth shark is a member of the extinct family Otodontidae — the giant sharks of the genus Otodus whose lineage runs from Otodus obliquus through auriculatus, angustidens and chubutensis to Otodus megalodon. The name refers to their enormous, heavily serrated teeth, usually all that fossilizes.
For how the lineage's teeth changed over time, see the Otodus shark lineage explained.