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The Japanese spider crab has the greatest leg span of any known arthropod, reaching up to 3.7 m (12.1 ft) from claw to claw. [6] The body may grow to 40 cm (16 in) in carapace width and the whole crab can weigh up to 19 kg (42 lb) [7] —second in mass only to the American lobster among all living arthropod
Hemigrapsus sanguineus, the Japanese shore crab or Asian shore crab, is a species of crab from East Asia. It has been introduced to several other regions, and is now an invasive species in North America and Europe. It was introduced to these regions by ships from Asia emptying their ballast tanks in coastal waters.
Heikegani (平家蟹, ヘイケガニ, Literal meaning: Heike Crab, Heikeopsis japonica) is a species of crab native to Japan, with a shell that bears a pattern resembling a human face – an example of the phenomenon of pareidolia – which is interpreted to be the face of an angry samurai, hence the nickname samurai crab.
Macrophthalmus japonicus, the Japanese mud crab, is a species of sentinel crab in the family Macrophthalmidae found in Asia. [1] The taxon was described by Wilhem de Haan in 1835. [ 2 ]
During the day, Calappa hepatica remains buried in sand with only the area round the eyes protruding. It emerges at night to hunt for prey, and can rebury itself in the substrate efficiently and fast if danger threatens. [6] It is a predator, and largely feeds on bivalve and gastropod molluscs, as well as hermit crabs.
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 ]
This crab is a predator, and feeds on invertebrates such as other crabs, as well as oysters and snails. It has a specially adapted right pincer which it uses to break open snail's shells. There is a large accessory tooth located at the base of the hinged part of the claw located opposite a flat plate on the fixed part, and it uses these as a vice.
Calappa is a genus of crabs known commonly as box crabs or shame-faced crabs. The name box crab comes from their distinctly bulky carapace , and the name shame-faced is from anthropomorphising the way the crab's chelae (claws) fold up and cover its face, as if it were hiding its face in shame.