Sure would've hated to see one of these things when it was living and it ate creatures it's own size? Wonder what else they'll discover in time.

Bus-Size Sea Monster Found, Took On Prey Its Own Size

By Brian Handwerk

Thalattoarchon saurophagis had large, sharp teeth, recent excavations show.A new species of prehistoric sea monster unearthed in Nevada chowed down on prey its own size—the first ocean predator that evolved to do so, a new study says. (Explore a sea monster interactive in National Geographic magazine.)Thalattoarchon saurophagis—which translates to "lizard-eating sovereign of the sea"—was at least 28 feet (8.6 meters) long and lived about 244 million years ago during the Triassic period, said study co-author Nadia Fröbisch of Berlin's Museum of Natural History.