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Crabs are crustaceans (subphylum Crustacea), marine arthropods (under phylum Arthropoda, characterized by joint appendages, exoskeletons, and segmented bodies). They are also in class Malacostraca along with shrimp, lobster, woodlice, krill, and others. Below that they are grouped in Decapoda (ten legs), suborder Pleocyemata (which carries around their eggs) and infraorder Brachyura (the true crabs).

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11y ago

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