It was a full meter long, dwarfing most of its companions in the Burgess Shale. Fossil evidence suggests that they lived during the Triassic period over 200 million years ago. In 1820, the Essex was lost in the southern Pacific Ocean. It’s quite hard to imagine it chasing anything around, so it presumably surprised trilobites etc. The sting of a Chironex fleckeri box jellyfish can kill a person in less than three minutes. Nothosaurus is thought to have mainly been an ambush predator, using its sleek reptilian figure to sneak up on prey and take it by surprise.

The great white shark has a profound hold on popular culture, but its long-gone big sister isn’t far behind. Decently boat-sized. Somewhere around 30 feet long, T. emnodontosaurus was a powerful swimmer with strong jaws, well-equipped to chow down on other Jurassic swimmers. Nature, of course, does not ‘come up with’ anything. Sea lions?

And in the shallow seas, we had another monster: Mosasaurus.

They can grow more than 20 feet long and weigh 3,000 pounds, and they have been known to hunt a wide range of prey, including monkeys, kangaroos, buffalo and even sharks. But reality is tiger sharks kill more people. But one of the largest creatures to ever swim the the sea wasn’t exactly a fearsome predator; Shastasaurus was a specialized suction feeder, eating mainly fish. If the Liopleurodon was huge, than Mosasaurus was colossal.
However, the truth is that while sea snakes out-venom their terrestrial counterparts, they're highly reclusive and so not much of a threat. Dakosaurus was first discovered in Germany and, with its odd reptilian-yet-fishy body, was one of the top predators in the sea during the Jurassic period. Another is Opabinia, which looks sort of like a five-eyed miniature vacuum cleaner. Back in the Palaeozoic and Mesozoic, cephalopods were armored critters, much like our modern nautilus. The innate human fear of snakes propels these slithering swimmers to the list.

But it’s much more fun to imagine this guy roaming the seafloor chomping down on everything, so that’s what we’ll do. Just the name practically qualifies these creatures for this list. Megalodon died out only relatively recently. This article was originally published on SB Nation a while ago, but was always intended for a Secret Base-y audience. It mostly lived in the seas that covered Europe during the Jurassic period, and it was one of the top predators around.

Let’s make the required tweaks. 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. Tiger sharks are found in many tropical and temperate waters, and they are especially common around islands in the central Pacific. To learn more or opt-out, read our Cookie Policy. That’s three average-sized men stacked on each others’ shoulders. Take a saltwater crocodile. Really, really big.

Some of the largest creatures this world has ever seen lived millions of years ago. Popular in home aquariums, these docile fish sport a striking fan of venomous spines. The puffer, named for its ability to suck in water and swell to twice normal size, could end up saving people: a drug made from the puffer's toxin has been tested for treatment of withdrawal symptoms from drugs like heroin. In another study, researcher Alison Leslie of the University of Stellenbosch found that climate change will also cause crocodile numbers to plunge. Livyatan Melvillei (Macropredatory Sperm whale) It depends on what you mean by “greater”. Tiger sharks will eat anything: fish, seals, birds, squid, small sharks, dolphins, license plates and pieces of old tires, according to NOAA. Thank you for signing up to Live Science. It would have hung around near the surface of the ocean, where there was an abundance of prey. The ability to kill a whole-ass whale with one bite is honestly horrifying, even if whales in Megalodon’s day were a little smaller than the current batch of great rorquals.

Thanks to their intelligence and pack-hunting techniques, orcas are, perhaps, the most dangerous hunters ever to … Receive mail from us on behalf of our trusted partners or sponsors? It’s believed that Nothosaurs were related to pliosaurs, another variety of deep sea predators. 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. But not so long ago, geographically speaking, there were also a group of ‘macroraptorial’ sperm whales. They’re considered cute, trainable and are major attractions at zoos, but have been known to bite people.
A bite from their razor-sharp teeth and powerful, locking jaws will produce ragged wounds that are prone to infection from the bacteria inside the eels’ mouths, according to NOAA.

It was enormous, reaching more than 50 feet (15m) in length. And the great white shark, of course, needs no introduction. A. canadensis would be higher on this list if we could be sure of what it actually ate. They tend to hide in crevices and holes during the day, then hunt at night. Here are ten of the largest, most fearsome sea monsters ever to prowl the oceans: The ichthyosaurs were marine predators that looked like modern dolphins, and could reach a massive size during the Triassic period over 200 million years ago.

Its jaws alone are believed to have been over 10 feet long – roughly the distance from the floor to the ceiling. On land during the day, we humans rule. 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. Saltwater crocs have earned a reputation as one of the wild kingdom’s most ferocious predators. It was also delightfully strange-looking. Anyway, all these critters were apparently food for the ocean’s first proper predator. Future US, Inc. 11 West 42nd Street, 15th Floor, Cam is an unreasonably poor high school student who freelances to support his nasty candy-eating habit. What's to worry about down there? In the skies, azhdarchids the size of small aircraft coasted from thermal to thermal. The technique is also employed to break apart large animals. The spear, which stiffens when the stingray feels threatened, is serrated like a steak knife and packs a venom that can be deadly to predators. Now you have a Jaekelopterus. Please deactivate your ad blocker in order to see our subscription offer, (Image credit: Mark Aplet, Dreamstime.com). They're fish, by the way, and they can be up to 8 feet long. Oh, and a little detail that explains why sharks aren't No. That’d be a bad day. Terrifying teeth in terrifying, dino-crushing jaws. TO THE IMAGINARY TIME MACHINE! With good eyes set on flexible stalks and a surprising turn of speed, Anomalocaris canadensis cruised the Pre-Cambrian seas in death-shrimp mode. Instead, they competed with Megalodon to hunt other great whales. 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. Let’s make their claws spikier, just for sheer scare value. More often than not, pain and death from sea creatures is avoidable, especially in the case of two on this list that inflict most of their damage in home aquariums and restaurants. Or at least we're considered top predators, and with our feet on the ground, we're in our element.


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