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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 life cycle of P. tuberculata is made up of three main stages: the egg, larval, and crab. The incubation time of P. tuberculata eggs has an inverse relationship to the temperature in which the ovigerous females live, with eggs hatching after 7 days at 26°C, and 80 days at 8°C. [8]
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 .
Japanese spider crab (Macrocheira kaempferi), the largest living species of crab, found on the bottom of the Pacific Ocean. Libinia emarginata, the portly spider crab, a species of crab found in estuarine habitats on the east coast of North America.
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 ]
Libinia spinosa is a member of the crab superfamily Majoidea which are commonly known as the spider crabs. [1] The carapaces of this organism can measure up to 89 mm and its leg span can be up to 568 mm. [2] The number of median spines of Libinia spinosa can vary, with 7 being the most common number, but Libinia spinosa with 5, 8, and 10 median spines are also seen commonly. [2]
Maja squinado (the European spider crab, spiny spider crab or spinous spider crab) is a species of migratory crab found in the Mediterranean Sea. [1] The appearance of the European spider crab is similar to the much larger Japanese spider crab, although the European spider crab belongs to the family Majidae, and the Japanese spider crab belongs to a different family of crabs, the Macrocheiridae.
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".