Deinosquatmasaurus

Deinosquatmasaurus was a species of aquatic reptile that lived in coastlines around North America. It might had resembled an outdated Atopodentatus, but is actually a completely different reptile species and unlike the Atopodentatus (which was a herbivore and had a duck-like bill), Deinosquatmasaurus was a carnivore and had a zipper-like mouth for hunting fish and other small aquatic animals, decapitating its prey in a process. They might had went extinct due to a Triassic-Jurassic Mass Extinction event.