<Li> Kaempferia kaempferi (Temminck, 1836) </Li> <P> The Japanese spider crab (タカアシガニ, takaashigani, lit . "tall - legged crab"), Macrocheira kaempferi, is a species of marine crab that lives in the waters around Japan . It has the largest leg span of any arthropod . It is the subject of fishery and is considered a delicacy . Two fossil species belonging to the same genus have been found, Macrocheira ginzanensis and Macrocheira yabei, both from the Miocene of Japan . </P> <P> The Japanese spider crab has the greatest leg span of any arthropod, reaching up to 5.5 metres (18 ft) from claw to claw . The body may grow to a size of 40 cm (16 in) in carapace width and the whole crab can weigh up to 19 kilograms (42 lb)--second only to the American lobster among all living arthropod species . The males have the longer chelipeds; females have much shorter chelipeds, which are shorter than the following pair of legs . Apart from its outstanding size, the Japanese spider crab differs from other crabs in a number of ways . The first pleopods of males are unusually twisted, and its larvae appear primitive . The crab is orange, with white spots along the legs . It is reported to have a gentle disposition, despite its ferocious appearance . The Japanese name for this species is taka - ashi - gani literally translating to "tall legs crab ." Their armored exoskeletons help protect them from larger predators such as octopuses, but giant spider crabs also use camouflage . The crab's bumpy carapace blends into the rocky ocean floor . To further the illusion, a spider crab will adorn its shell with sponges and other animals . </P> <P> Japanese spider crabs are mostly found off the southern coasts of the Japanese island of Honshū, from Tokyo Bay to Kagoshima Prefecture . Outlying populations have been found in Iwate Prefecture and off Su - ao in Taiwan . Adults can be found at depths between 50 and 600 m (160 and 1,970 ft). They like to inhabit vents and holes in the deeper parts of the ocean . The temperature preference of adults is unknown, but the species is regular at a depth of 300 m (980 ft) in Suruga Bay where the water generally is about 10 ° C (50 ° F). Based on results from public aquariums, Japanese spider crabs tolerate at least between 6 and 16 ° C (43 and 61 ° F), but are typically maintained at 10--13 ° C (50--55 ° F). </P>

Why is a spider crab called a spider crab
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