The XO Directory

Named by its discoverers as the "The Monster", Pliosaur is the fiercest sea monster that terrorized the prehistoric oceans 150 million years ago.

The 50-foot animal was one of the biggest marine predators to have ever swum and would have been able to take on "anything that moved" in the water. It was built for speed and power, and with its armory of fangs would have been rivaled in ferocity only by an extinct shark, the megalodon, which lived about 16 million years ago. Fossilized remains of the pliosaur, which had 10-foot-long jaws, were located on the island of Spitsbergen in the Norwegian archipelago of Svalbard, inside the Arctic Circle.

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