Crab
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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
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 mottled lightfoot crab is herbivorous.
Carcinisation
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Carcinisation is a form of convergent evolution in which non-crab crustaceans evolve a crab-like body plan. The term was introduced into evolutionary biology by Lancelot Alexander Borradaile, who desc
Porcelain crabs resemble true crabs, but are more closely related to squat lobsters and hermit crabs.