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Eurypterids are members of an extinct order of arthropods that lived approximately 505 to 245 million years ago. Frequently referred to as giant scorpions, most eurypterids were small, although Pterygotus buffaloenis, a species from the Silurian period, was the largest arthropod ever known, reaching a length of about 10 ft (3 m). Living in brackish waters, some were predators, while others were probably scavengers. Eurypterids were similar in body plan to what modern sea creature? Discuss
Source: The Free Dictionary