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Jaekelopterus Rhenaniae, A.K.A the Mega Sea Scorpion, was the largest known arthropod it belong to the family of pterygotid eurypterids a group commonly referred to as sea scorpions as such they mostly resembled scorpions and the living horeshoe crabs. Jaekelopterus reached around 18 feet. Remains have been found from what was then a fresh water environment .

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