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The Japanese spider crab has an armored exoskeleton that helps protect it from larger predators such as octopuses, but also uses camouflage. The crab's bumpy carapace blends into the rocky ocean floor. To further the deception, a spider crab adorns its shell with sponges and other animals. [10]
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.
Cancer pagurus, the edible crab or brown crab, is a species found in the North Sea, North Atlantic and the Mediterranean Sea. It is a robust crab of a reddish-brown colour, having an oval carapace with a characteristic "pie crust" edge and black tips to the claws. [11] Mature adults may have a carapace width of up to about 25 cm and weigh up to ...
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.
Trichonephila clavata, also known as the Joro-spider (ジョロウグモ, Jorō-gumo), is a spider in the Trichonephila genus. Native to East Asia , it is found throughout China , Japan (except Hokkaidō ), Korea , and Taiwan , and has been spreading across North America since the 2010s.
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.
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.
The carapace may reach 15 centimetres (5.9 in) wide, and 7 cm (2.8 in) from front to back. P. trituberculatus may be distinguished from the closely related (and also widely fished) P. armatus by the number of broad teeth on the front of the carapace (three in P. trituberculatus, four in P. armatus) and on the inner margin of the merus (four in P. trituberculatus, three in P. armatus).