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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]
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.
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.
Longnose spider crab: Atlantic coast of North America: Uses noxious alga Dictyota menstrualis [1] Loxorhynchus crispatus: Masking or moss crab: Eastern Pacific Ocean [1] Prefers to decorate with bryozoan Bugula neritina: Hyas araneus: Great spider crab: North Atlantic, North Sea [5] Camposcia retusa: Harlequin crab or spider decorator crab ...
Tachypleus tridentatus, commonly known as the Chinese horseshoe crab, Japanese horseshoe crab, or tri-spine horseshoe crab, is a species of horseshoe crab found in Southeast and East Asia, with records from China, Indonesia, Japan, South Korea, Malaysia, the Philippines, Taiwan, and Vietnam.
Tasmanian giant crab in Sydney Aquarium, Australia. 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]
As a decorator crab, this crab attaches seaweed or algae from its environment to the hooked hairs on its body, which gives this crab camouflage along the ocean floor. [6] Hairy seaweed crabs change their camouflage with 10-20% of the cover being replaced each day, this causes their movement to be very sluggish like many other spider crabs.
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).