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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 .
family Majidae Samouelle, 1819 – "true" spider crabs; family Mithracidae Balss, 1929; family Oregoniidae Garth, 1958; family †Priscinachidae Breton, 2009; Notable species within the superfamily include: Japanese spider crab (Macrocheira kaempferi), the largest living species of crab, found on the bottom of the Pacific Ocean.
Macrocheira is a genus of crab in the superfamily Majoidea. [1] It contains the Japanese spider crab ( Macrocheira kaempferi ) as well as an extinct species, Macrocheira longirostra . [ 2 ]
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Crabs vary in size from the pea crab, a few millimeters wide, to the Japanese spider crab, with a leg span up to 4 m (13 ft). [6] Several other groups of crustaceans with similar appearances – such as king crabs and porcelain crabs – are not true crabs, but have evolved features similar to true crabs through a process known as carcinisation .
The 67,000 described species range in size from Stygotantulus stocki at 0.1 mm (0.004 in), to the Japanese spider crab with a leg span of up to 3.8 m (12.5 ft) and a mass of 20 kg (44 lb). Like other arthropods, crustaceans have an exoskeleton, which they moult to grow.
Majidae is a family of crabs, comprising around 200 marine species inside 52 genera, with a carapace that is longer than it is broad, and which forms a point at the front. The legs can be very long in some species, leading to the name "spider crab".
3.7 m – leg span of a Japanese spider crab; 3.7 m – length of a southern elephant seal, the largest living pinniped; 5 m – length of an elephant; 5.2 m – height of a giraffe [122] 5.5 m – height of a Baluchitherium, the largest land mammal ever lived; 6.5 m – wingspan of Argentavis, the largest flying bird known