252 Million years ago, there was a wave of excitations, the biggest wave in all of marine history, this exception was often referred to as the ‘Permian extinction’, which wiped out roughly 90% of all marine species at the time. After that wave of extinctions, life underwater rebounded faster then most would have thought, after only a couple million years, ecosystems in the artic were thriving, as shown in fossils dug up, these seas were now ruled by reptiles and fish, though their were ammonites, and newly found coral-like organisms that were actively rebuilding the ecosystems that were once there
360 million years ago, in the Devonian seas, there was an apex predator by the name of the ‘dunkleosteus’, this fish could grow above 14 feet long, with bone blade-like structures replacing their teeth, they were capable of slicing through prey with terrifying efficiency. the Dunkleosteus was one of the earliest examples of a super-predator, building marine food-webs long before the uprising of the sharks taking over the seas of the earth
only 130 million years ago, in the Jurassic and cretaceous there lived a sea predator in the times of dinosaurs like the tyrannosaurus-rex, or the velociraptor, this sea monster by the name of ‘Pilosaurus’ was dominating the oceans at the time, the Pilosaurus’ had huge skulls, and powerful jaws, with paddle like limbs, making them into fast swimmers and amazing ambush hunters. Scientists believe that they were so powerful that they could have hunted for animals as large as the modern killer whales.