Crab

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Crabs are decapod crustaceans, either the Brachyura (the "true crabs") or various groups within the closely related Anomura (hermit crabs and allies), characterised by having a heavily armoured shell, their tail segments concealed under the body, the ability to run sideways, and the habit of hiding in rocky crevices. They do not form a single natural group or clade, but have convergently evolved multiple times from the ancestral decapod body plan through carcinisation, the process of creating this set of characteristics. As a group, they are thus polyphyletic, meaning they have multiple…

Metopograpsus es un género de cangrejos, que contiene las siguientes especies:​ Especies Metopograpsus frontalis Miers, 1880 Metopograpsus latifrons (White, 1847) Metopograpsus messor (Forsskål, 1775) Metopograpsus oceanicus (Hombron & Jacquinot, 1846) Metopograpsus quadridentatus Stimpson, 1858 Metopograpsus thukuhar (Owen, 1839) Una especie extinta más se conoce.