Crabs are decapod crustaceans, either the Brachyura or various groups within the closely related Anomura, characterised by having a heavily armoured shell, their tail segments concealed under the body
Cancer pagurus, the edible or brown crab (Brachyura)
Adult pea crab, one of the smallest species, a few millimetres across
Coconut crab, the largest terrestrial arthropod, weighing up to 4.1 kg (9 lb)
Japanese spider crab, with a leg span of as much as 4 m (13 ft)
The Japanese giant spider crab is a species of marine crab and is the largest crab found in the waters around Japan. At around 3.75 metres, it has the largest leg-span of any arthropod. The Japanese n
Crab
…group, they are thus polyphyletic, meaning they have multiple evolutionary origins. 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). Many crabs are free-living marine omnivores; others are specialist herbivores or carnivores, while some are parasitic…
A Japanese spider crab at the Manila Ocean Park, the Philippines
At Sunpiazza Aquarium in Sapporo, Japan