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Pachygrapsus marmoratus is a species of crab that lives in the Black Sea, the Mediterranean Sea, and parts of the Atlantic Ocean. It is dark violet brown, with yellow marbling, and with a body up to 36 millimetres (1.4 in) long. It is an omnivore, feeding on algae and various animals including mussels and limpets.Photograph: Petar Milošević