https://www.vice.com/en_us/article/n7n4nq/nobody-knows-what-megalodon-really-looked-like-scientists-say

It’s not hard to see why Megalodon, an epic species of shark that died out some 3.6 million years ago, has captivated the public imagination and become the star of movies like The Meg. Because Megalodon has become such an iconic sea monster, most people picture the species as its pop culture incarnation: A beefed-up great white shark with a thirst for human blood. But here’s the thing: nobody actually knows what the giant sea creature, which is officially named Otodus megalodon, looked like. 

According to a study published on Sunday in Historical Biology, “all previously proposed body forms for O. megalodon should be regarded as speculations because there are no scientific means to decisively support or refute the accuracy of any of them.”