Top 10 Scariest Prehistoric Sea Creatures

Megalodon

The megalodon, an extinct species of giant mackerel shark, lived from approximately 23 million to 3.6 million years ago. Its exact maximum size remains uncertain, though some estimates place the largest individuals at more than 50 feet long, making them much larger than today's great white shark.... read more

This thing is 20meters long that's larger then a whale shark

A huge shark that can eat you whole.

If you think mosasaurus first then you're weird. if you watched jurassic world then the real mosasaur is two times smaller. Its teeth were designed to crush small ammonites and turtles. megalodon teeth were designed to kill animals two times its size in one bite. sooo...

Liopleurodon

Liopleurodon is a genus of large, carnivorous marine reptiles that belonged to Pliosauroidea, a group of short-necked plesiosaurs. These reptiles lived during the Callovian stage of the Middle Jurassic Period, approximately 166 to 163 million years ago. Fossils of Liopleurodon have been discovered in... read more

Liopleurodon's bite force is 10 TIMES STRONGER THAN T. REX! And a T. Rex's bite is three times stronger than a crocodile, which is almost exactly 50 times stronger than a human's strongest bite! Which makes the Liopleurodon's bite 1,500 stronger than a human's bite. Whoa...

The Liopleurodon will forever be my favorite animal.

Mosasaurus

Tanystropheus

Thalattoarchon

Tylosaurus

Nothosaurus

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Thalassomedon

Dakosaurus

Shastasaurus

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Eurypterid

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Orthoceras

Helicoprion

Dunkleosteus

This denizen of the Devonian is not the biggest creature on this list. It is, admittedly, probably not the most objectively dangerous. But what I find unsettling about Dunkleosteus is its beaklike jaws. Those could shear a limb-maybe even a head-clean off a hypothetical time-traveling scuba diver. In addition, Dunkleosteus seems just the right size to consider a human worthwhile prey.

Gigantic fangs that could easily impale you...