This animals from the Jurassic period, see more animals

Jurassic period.

If Jurassic Park had an aquarium scene, and actually featured more animals from the Jurassic period, liopleurodon probably would have been in it.

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Although the actual length of these beasts is contested (some scientists have claimed lengths in excess of 50’).

Jurassic period.

Most agree that it was around 20 feet in length, with a full fifth of that being pointy-toothed head.

When the mouth of the “smaller” estimate is still plenty large to eat you whole, I think that is perfectly huge enough.

Scientists have tested the paddle design of these creatures on small swimming robots and found that although they would not have been incredibly fast, they were incredibly agile.

They also would have been able to make short, fast burst attacks like crocodiles, which in no way makes them any less intimidating.

Jurassic period
Liopleurodon (25 m)
Jurassic period
Basilosaurus (21 m)


Despite the name and appearance, that is not a reptile, but actually a whale (and not even the most fearsome on the list!)

Basilosaurs were predatory ancestors of modern whales, and could be 50 to 85 feet long!

It is described as being the closest a whale has ever come to being a snake because of how long and sinuous it was.

Imagine swimming in the ocean with an 80+ foot long alligator-snake-whale. Now imagine being afraid to even take a bath ever again.

Physical evidence suggests that basilosaurus did not have the cognitive ability of modern whales, nor the ability to echolocate, and could only navigate in 2 dimensions (so no deep diving or breaching).

So at least this monster whale was dumber than a bag of prehistoric hammers and could not chase you if you dove or scrambled out on dry land, probably forever.

Jurassic period
Megalodon (18,2—20,3 m)

Jurassic period.

Megalodon is probably the best-known creature in the list; it’s hard to keep the idea of a shark the size of a school bus out of pop culture.

Plus, science-minded entertainment sources like the Discovery Channel love creatures that could pass for a movie monster.

Despite the popular idea that Megalodon coexisted with dinosaurs, they lived from 25 to 1.5 million years ago, meaning that at best they missed the last dinosaur by 40 million years.

On the other hand, this meant they might have still been around for the first humans.

Megalodons swam the warm oceans that were around until the last ice age in the early Pleistocene, which may have robbed them of their breeding grounds and food. Sometimes, it seems nature has our back.

Livyatan melvillei (13,5-17,5 m)

Remember me mentioning “hypercarnivorous” whales?

Well here it is. Imagine a cross between an orca and a sperm whale. Livyatan melvillei was a whale that ate other whales.

It had the largest teeth of any animal to ever use their teeth to eat (elephant tusks are bigger, but they just look impressive and help them smash things; they don’t eat with them) topping out at 1.18 feet.

They lived in the same oceans and ate the same food as the Megalodon, so this whale actually had to compete with the largest predatory shark ever.

Not to mention their head was 10 feet long and featured the same echo-locating equipment as modern toothed whales, making them much more effective in murky water.

In case it was not obvious, this beast was named after the leviathan, a giant sea monster from the bible, and Herman Melville, who wrote Moby Dick.

If the great white whale had been one of these, it would have eaten the Pequot and everyone aboard as a snack.

Jurassic period.

Megalneusaurus (10-12 m)

Paleontologists don’t know a whole lot about Megalneusaurus; this impressively named pliosaur (its moniker means “great swimming lizard”) has been reconstructed from scattered fossils discovered in Wyoming.

How did a giant marine reptile wind up in the American midwest, you ask?

Well, 150 million years ago, during the late Jurassic period, a good part of the North American continent was covered with a shallow body of water called the “Sundance Sea.”

Judging from the size of Megalneusaurus’ bones, it appears that this pliosaur may have given Liopleurodon a run for its money, attaining lengths of 40 feet or so and weights in the neighborhood of 20 or 30 tons.

However, this marine reptile would still have been no match for Megalodon, a prehistoric shark that lived tens of millions of years later and weighed as much as 50 tons.

Kronosaurus (9-10 m)

Kronosaurus is another short-necked pliosaur (like Liopleurodon up at number 9), and like Liopleurodon, its overall length has been contested. It was a “mere” 30 feet long and the longest teeth in its massive mouth were up to 11 inches long.

This is why it was named after Cronus, the king of the old Greek Titans.

Jurassic period, Guess where it lived?

If you guessed “Australia”, then you have been paying attention to life (and are correct). The head was up to 9 feet long.

They could eat an entire modern man whole, and still have room left over for half of another. It has also been suggested that since their flippers are so similar in design to those of modern sea turtles, that they may have crawled out onto land to lay eggs.

You can be sure no one was digging up these thing’s nests to get at the eggs.

Jurassic period
Dunkleosteus (8-10 m)


Dunkleosteus was a 30 foot long carnivorous tank. It was outlasted by sharks, but I am sure that is small consolation for the variety of creatures this beast ate. Instead of teeth, it had bony ridges, like a turtle.

It has been calculated that they had a bite force of 8,000 pounds per square inch, putting it on par with crocodiles and T-Rex in terms of being history’s strongest biters.

They also believe, based on the evidence in the skull regarding its musculature, that it could have opened its mouth in one fiftieth of a second, meaning it vacuumed food into its guillotine of a mouth.

The plates that made up the “teeth” changed as the fish aged from a solid, rigid jaw to segments that allowed it to hold prey easier, and made it more effective in biting through the bony plate armor of other armored fish.

In the arms race that was the prehistoric ocean, Dunleosteus was a predatory super tank.

Dorudon (5 m)


Dorudon (“Spear-Tooth”) was a genus of ancient cetacean that lived alongside Basilosaurus 41 to 33 million years ago, in the Eocene.

They were about five meters (16 ft) long and were most likely carnivorous, feeding on small fish and mollusks. Dorudontines lived in warm seas around the world. Fossils have been found in North America, Egypt as well as Pakistan the eastern part of which bordered the ancient Tethys Sea.

Helicoprion (2-3 m)

These sharks grew to be about 15 feet long, and had a lower jaw that was made of a “tooth whorl”. It looks like a cross between a circular saw and a shark, and when you mix apex predators with power tools, the world quakes in fear.

Helicoprion’s teeth were serrated, implying that they were definitely carnivores, but there is some debate as to whether their teeth were in the front of the mouth, as shown in the picture, or if they were farther back, which would suggest a softer diet, like jellyfish.

However it was arranged, it clearly worked; Helicoprion survived the Permian Triassic extinction, which means they may have been smart enough to create bomb shelters.

Or maybe they just lived in the deep sea.

Jaekelopterus rhenaniae (0,2-2 m)

Nothing about the words “sea scorpion” are comforting to begin with, so this should not come off as too awful: this was one of the two largest arthropods to have ever lived, reaching a length of over 8 feet of armored, clawed horror.

Most of us freak out at the thought of inch-long ants and foot wide spiders, so it’s easy to imagine screaming like a little girl if you ever stumbled across a living one of these.

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.

There is no evidence that any sea scorpions were actually venomous, but the structure of their tail is similar to a modern scorpion’s, so it might have been.

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