The Japanese spider crab ("Macrocheira kaempferi") is a species of marine crab, and is the only member in the genus Macrocheira. It is found only in the waters around Japan. The Japanese spider crab has the largest leg span of any arthropod in the world, reaching up to 3.8 meters (12 ft) long, and weighing up to 41 pounds (19 kg).
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