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(Macrocheira kaempferi), species of spider crab (q.v.) native to Pacific waters near Japan. It occurs at depths of 50 to 300 m (150 to 1,000 feet). The largest specimens may be up to 3.7 m or more from the tip of one outstretched claw to another. The body is about 37 cm (15 inches) across, and the total weight of the body is more than 18 kg (40 pounds). The giant crab (order Decapoda of the class Crustacea) is probably the largest known species of the invertebrate phylum Arthropoda.