(Feb. 9, 2015) http://www.bbc.co.uk/nature/life/Pliosaur, Borenstein, Seth. "Motorboat-Size Sea Monster Found, Sheds Insight on Evolution." De Agostini Picture Library/De Agostini/Getty Images, Nobumichi Tamura/Stocktrek Images/Getty Images, Animal Planet. It belonged to genus mosasaurs and existed during the MaastrichtianÂ. "Monster shark 'kept whales in check.'" Carcharodon megalodon was definitely much scarier than any living shark. It was one of the largest (but not the scariest!) Tap to Read 10 Extinct Sea Creatures As Terrifying As The Dinosaurs. "Dorset pliosaur: 'Most fearsome predator' unveiled." "Tanystropheus." You consent to our cookies if you continue to use our website. This drawing shows an artist's impression of the Archelon turtle; the Stupendemys is thought to be even bigger. The Guardian. Feb 14, 2017 - 7 Extinct Sea Monsters, Straight Out Of Your Nightmare #megalodon #seamonster #dunkleosteus #pliosaur #Mosasaurus The Tanystropheus had a 20-foot neck, which allowed it to pluck fish out the water without getting wet. National Geographic. "Pliosaurs." This terrifying carnivore had an extra set of teeth and weighed 5,000 kgs. Jan. 12, 2015 (Feb. 10, 2015) http://www.theguardian.com/science/shortcuts/2015/jan/12/new-dinosaur-golden-age-jurassic-discovery-skye, Museum of Unnatural History. Helicoprion belonged to the extinct eugeneodontid holocephalid. Mark. The Dunkleosteus was a monster fish which lived during the Devonian period. NPR. 15. (Feb. 8, 2015) http://www.fossilguy.com/gallery/vert/reptile/mosasaur/, McCormick, Cameron. These scariest extinct sea creatures could gobble up a human like a tea-time snack. The frilled shark dates back roughly 80 million years and was thought to be extinct until two Australian fisherman accidentally caught one in 2015. (Feb. 9, 2015) http://www.prehistoric-wildlife.com/species/s/stupendemys.html, Prehistoric Wildlife. A large mosasaur i.e. This is an amazing … "Prolacertiformes." an aquatic lizard is another scary one on our list of 'Extinct Sea Creatures'. On the plus side, sea scorpions (Euripterids) have been extinct since before the dinosaurs, having been wiped out in the Permian Triassic extinction event (which killed 90% of all life on earth) and are only survived, to some degree, by horseshoe crabs, which are even less formidable than regular crabs. Oct. 23, 2014 (Feb. 9, 2015), Rincon, Paul. "Living fossil captured." Kronosaurus is another one from the extinct pliosaur group. Other people picture a pack of wolves when thinking of scary animals. Enya Kim, from auctioneers Bonhams & Butterfields' natural history department, stands inside a set of shark jaws from the prehistoric species. Many consider snakes or venomous spiders the most frightening animals alive. The Megalodon is one of the largest extinct sea creatures. Basilosaurus, though looked like a monstrous lizard, was a whale. The Tylosaurus usually swallowed its prey whole. (Feb. 8, 2015) http://www.unmuseum.org/kraken.htm, National Geographic. Speaking of crocodiles, the Sarcosuchus looked like a modern-day croc. July 8, 2011 (Feb. 9, 2015) http://www.bbc.com/news/science-environment-14061347, Moss, Stephen. Scientific American. Jan. 14, 2015 (Feb. 8, 2015) http://www.setfia.org.au/item/living-fossil-captured.html, University of California Museum of Paleontology. March 11, 2010 (Feb. 8, 2015) http://cameronmccormick.blogspot.com/2010/03/stupendemys-giant-amongst-mega-turtles.html, Morelle, Rebecca. sea creatures which existed about 40 to 35 million years ago. The most recently surviving ocean predator on the list, Megalodon went extinct … The Helicoprion, with its signature circular saw, was reconstructed for a traveling exhibition in 2006. A large mosasaur i.e. "Dunkleosteus." "Stupendemys." Our Earth is much older than the reign of dinosaurs and there were many such nightmarish creatures who ruled the world. Batul Nafisa Baxamusa Feb 4, 2020 . The two rows of sharp teeth on the upper and the lower jaw made sure nothing could escape its bite alive. "Dunkleosteus." BBC. "Prehistoric ghost shark Helicoprion's spiral-toothed jaw explained." The pilosaur was described as a crocodile on steroids; it could be as long as 59 feet. "Mosasaur: Facts and Information about the Giant Marine Reptile." (Feb. 8, 2015) http://animals.nationalgeographic.com/animals/prehistoric/tylosaurus/, Prehistoric Wildlife. This extinct whale was named both for the monstrous sea creature Leviathan from the old-testament that “…when he rises up, the mighty are terrified; they retreat before his thrashing” and for Herman Melville, the author of the novel Moby Dick, a tale of an accursed white whale that terrorized Captain Ahab and eventually brought about his death and the destruction of his ship and crew. Named after the Maori god Maui, this was an enormous sea creature which measured about 26 feet in overall length. They were huge ocean-dwellers and could easily tower over the great white sharks. (Also, the thing would simply have climbed up the chair to say hi anyway.) Tylosaurus had a powerful tail and paddle-like limbs. The Dunkleosteus ate just about everything it could get its fins on. Weird & Wacky, Copyright © 2020 HowStuffWorks, a division of InfoSpace Holdings, LLC, a System1 Company. BBC. The Arthropleura was an ancient millipede-like creature that crawled around on its many legs some 300 million years ago. The nudibranch are a group of over 3,000 sea slug-like creatures that are known for their colorful appearances. Daily Mail. "James Cameron Sees 'Another Planet' in the Deepest Sea." Oct. 23, 2014 (Feb. 8, 2015) http://www.bbc.com/news/science-environment-29743081, South East Travel Fishing Industry Association. We also share information about your use of our site with our social media, advertising and analytics partners who may combine it with other information that you’ve provided to them or that they’ve collected from your use of their services.