LIOPLEURODON was the biggest plesiosaur. Liopleurodon was not a dinosaur, but a short-necked plesiosaur (a pliosaur), an extinct, swimming reptile. It lived during the late Jurassic period in Europe and Eastern Europe.
One Crazy Set of Teeth The Helicoprion was a shark-like fish that arose in the oceans of the late Carboniferous 280 million years ago, and eventually went extinct during the early Triassic some 225 million years ago
tyrannosaurslair: “ dryptosaurus: “ Cretaceous Sea by unknown artist ” For me, this reminds me of the nightmares I used to have about mosasaurs and other marine reptiles when I was a kid, I was scared.