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Once upon a time, 400 million years ago, gigantic scorpions ruled the seas as fierce predators larger than basketball players, but they suddenly and mysteriously vanished about 393 million years ago, ...
Pterygotus was an enormous sea scorpion, one of the largest arthropods to have ever existed, reaching lengths of up to 8 feet. It lived in the ancient oceans, where it was an apex predator.