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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. The Japanese name for this species is taka-ashi-gani, (Japanese: タカアシガニ), literally translating to "tall legs crab". It goes ...
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Although most crustaceans are small, their morphology varies greatly and includes both the largest arthropod in the world – the Japanese spider crab with a leg span of 3.7 metres (12 ft) [45] – and the smallest, the 100-micrometre-long (0.004 in) Stygotantulus stocki. [46]
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.
P. monodon is the second-most widely cultured prawn species in the world, after only whiteleg shrimp, Litopenaeus vannamei. In 2009, 770,000 tonnes were produced, with a total value of US$3,650,000,000. [1] P. monodon makes up nearly 50% of cultured shrimp alone. [20]
Most lophogastridan species are 1–8 centimetres (0.4–3.1 in) long, but Gnathophausia ingens can be up to 35 cm (14 in), probably the largest pelagic crustacean in the world. [1] Some 56 extant species in total are currently known. They are classified into three families and nine genera. [2]
Krill are crustaceans and, like all crustaceans, they have a chitinous exoskeleton. They have anatomy similar to a standard decapod with their bodies made up of three parts : the cephalothorax is composed of the head and the thorax , which are fused, and the abdomen , which bears the ten swimming appendages, and the tail fan .
The Tasmanian giant crab is one of the largest crabs in the world, reaching a mass of 17.6 kg (39 lb) and a carapace width of up to 46 cm (18 in). [6] Among crabs, only the Japanese spider crab (Macrocheira kaempferi) can weigh more. [5] Male Tasmanian giant crabs reach more than twice the size of females, [7] which do not exceed 7 kg (15 lb). [6]