A combination of two of humans’ biggest fears – alligators and scorpions – Eurypterid was like a scorpion which, from one found fossil, could reach the size of an alligator.

Animal trivia: Eurypterid of strange prehistoric animals
Animal trivia: Eurypterid of strange prehistoric animals

Primarily an ocean-dweller, this creature was not a true scorpion. Found all over the world, Eurypterid finally went extinct during the Permian-Triassic extinction event 252.17 million years ago. Most only grew up to 8 inches (20 cm) long, but the infamous subspecies Jaekelopterus was bigger, making it the largest arthropod yet discovered.

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