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What is the difference between flat crab and swimming crab?
Flat crab generally refers to the yongjian swimming crab, also called hairy crab. The whole body is orange-red, with white spots on the large claws of the frontal region and on the swimming legs, and a purplish-red spot at the tip of the other swimming leg; the carapace width is 1.8 times the carapace length. The swimming crab's body color varies with its surroundings; the carapace is light grayish-green, with a round white spot in the anterior branchial region, the chelipeds are mostly purplish-red with white spots, and part or all of the ventral surface is white.