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Japanese spider crab

The Japanese spider crab (Macrocheira kaempferi) is a species of marine crab and is the biggest one that lives in the waters around Japan. At around 3.7 meters, it has the largest leg-span of any arthropod. The Japanese name for this species is taka-ashi-gani, (Japanese: たかあしがに), literally translating to “tall legs crab”. It goes through three main larval stages along with a prezoeal stage to grow to its great size.[2]

Japanese spider crab  Click to go to Wikipedia