Shrigger

A shrigger is a future descendant of the clown triggerfish that evolved to become one of the top carnivore of the sea, except that toothed whales remain the true top predators. Different species of shriggers vary in different species, ranging from the size of the extinct blacktip reef shark to the size of the extinct great white shark. They are predatory, feeding mainly on crustaceans, cephalopods, fish, sea turtles, and marine mammals, depending on a different species.

Evolution
After the Late Holocene ended, the humans are gone, but it was already too late for many species of sharks, almost all large sharks became extinct, only small sharks and whale sharks survived. But because many remained small, empty niches were left for other fish species. Clown triggerfishes were among those fishes that filled the niche that were left behind by the now-extinct large sharks. Clown triggerfishes grew much larger and their bodies elongated. Their fins changed shape to help them go faster in order to catch faster prey. In some species, their teeth grew longer and many species had their teeth grown sharper over time to hunt more different types of prey items, with some even big enough to hunt small whales and pinnipeds. Eventually, clown triggerfishes had evolved into shriggers.