Edestus
These scissor-toothed sharks are now extinct animals that used to use vertical thrashing to kill their prey. New research discovered they had some seriously crazy external teeth, which they used to their advantage. Their jaw was similar to the Helicoprion, but their arc of teeth was on the floor and on the roof of its mouth. They used their highly curved whorls to subdue and eat their prey. These terrifying extinct animals were found around the world, in the United States, Russia, and the United Kingdom (Earth Archives).