Somewhere around 30 feet long, T. emnodontosaurus was a powerful swimmer with strong jaws, well-equipped to chow down on other Jurassic swimmers. So let’s go to the deep, deep past, revealed wonderfully by the Burgess Shale. Salties are strong, fast and surprisingly smart. Plus, science-minded entertainment sources like the Discovery Channel love creatures that could pass for a movie monster. It’s quite hard to imagine it chasing anything around, so it presumably surprised trilobites etc. The only fossils that have been found of this animal contain sets of spiraled teeth, and scientists are still trying to figure out just how they would have possibly fit into the shark’s mouth. Sightings of these deadly stinging sea creatures have rose in recent years and are seen the most during UK heatwaves. Biblical scholars may know leviathan from Isaiah 27:1: "In that day the Lord with his sore … One creature that adventurers are advised to watch out for when traveling across the sea are Dragon Turtles. Cool, but nowhere near the sort of weirdness the past can provide. Their 30ft long harmful tentacles … Like all crocodiles, they’re ambush predators who use water as cover to attack their prey. Viperfish is generally characterized by its long needle-like teeth. They were absolute apex predators, preying on sharks and basically anything it could catch (everything). During the late Cretaceous (80 million years ago), North America was split by a shallow sea, the Western Interior Seaway. With bone-plated heads and upper bodies, these fish probably didn’t swim very well, but who cares? They looked cool as hell, and with that body armor they were well protected against predators. Here we shall find the NIGHTMARE SHRIMP. Despite its size, scientists estimate this reptile probably swam surprisingly fast, and like many sharks, Liopleurodon had an excellent sense of smell, which it used to locate prey. Unlike most crocodiles they’re capable of jumping clear out of the water to get to it. Since sharks are mostly soft tissue, they don’t fossilize as well as we’d like, but their teeth do, and Megalodon’s tell a terrifying story. Nature, of course, does not ‘come up with’ anything. For whatever reason, the fauna of Cretaceous period got big. This monster considered 13-foot oceanic reptiles a delicious snack. They’re not averse to grabbing a fish here or a mollusk there, but they’re not built for hunting. Anyway, all these critters were apparently food for the ocean’s first proper predator. Say hello to some horrifying sea monsters. This article was originally published on SB Nation a while ago, but was always intended for a Secret Base-y audience. And in the shallow seas, we had another monster: Mosasaurus. What you probably haven’t heard of is Livyatan. One closely-related species possessed the largest eyes of any known animal, perfect for hunting in deeper oceanic waters; another has been found with the remains of a different ichthyosaur in is stomach. Viperfish. Apparently, these things liked to swim up from underneath its prey and bite through their chest to reach their internal organs. The era of armored fishes is one of the most fabulously strange in the entire history of the planet. Since eurypterids (to give them their proper name) went extinct hundreds of millions of years ago, we don’t have very good comparisons for what these things were like. The ocean is massive - and the creatures lurking beneath its surface can grow to sizes that would be impossible on land. One of the problems with studying the very earliest phase of animal life — we’re talking half a billion years at this point — is that it’s squishy, and squishy is not of much benefit when it comes to preserving fossils. Long-held to be a trilobite-hunter, recent studies have shown it would probably have had to restrict itself to soft-bodied prey due to relatively flimsy mouthparts, and therefore could only have actually eaten a trilobite just after a moult. Despite their ferocious armament, lobsters are relatively placid creatures. Here are ten of the largest, most fearsome sea monsters ever to prowl the oceans: 10. Actually, it’s probably best not to. Like Cameroceras. We need to add eyes. The ship had been sent out to hunt for sperm whales (Physeter macrocephalus, since you asked), but soon had the tables turned when it was attacked and sunk by a ferocious bull. Flower Urchin. Its legs were replaced with bladed paddles for maneuverability and it had a powerful tail for direct propulsion. Box Jellyfish is also on our 10 Most Dangerous Animals In The World list.The most dangerous creature in the ocean doesn’t have a venomous bite, rows of sharp teeth, or even an obvious mouth for that matter. It is so odd, in fact, that when it was discovered its various body parts were assigned to several different animals. In the middle of the ocean, no one can hear you scream. Modern sperm whales are enormous creatures, but very rare boat attacks aside, they’re only really dangerous to their favorite prey, deep-swimming squid. TO THE IMAGINARY TIME MACHINE! Well, a lot carried away. Here are 9 of the most badass animals ever to swim. It’s not the largest ichthyosaur ever to grace the seas, but it’s up there, and it’s a far more developed predator than its giant forebears. Let’s make their claws spikier, just for sheer scare value. D. hatcheri was present on both the western side of the seaway (a slightly smaller species dominated the east), happily chowing through dinosaurs who were foolish enough to get too close. Measuring at more than 50 feet long, the megalodon was the largest known shark of all time. Which, as it turns out, is the sort of inspiration nature needs to come up with some better predators*. A sea monster is, by definition, any creature that comes from the sea – real or mythical – and is unusually large or threatening. It’s not clear whether or not Livyatan hunted alone or in packs, like a modern killer whale, but it had the power and size to be able to plausibly compete with Megalodon even solo. Fast-forward even further, to the early Jurassic (175 million years ago), and you have Temnodontosaurus eurycephalus. They are, after all, 20-foot, 2,000-pound apex predators more than happy to eat anything they come across, including you. Armored skin thick enough to turn aside more or less anything. Oh and let’s make them 10 feet long and perfectly happy to eat you alive. Yeah, like that. It was a full meter long, dwarfing most of its companions in the Burgess Shale. Right. Back in the Palaeozoic and Mesozoic, cephalopods were armored critters, much like our modern nautilus.
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