Liocarcinus marmoreus, sometimes known as the marbled swimming crab, is a species of crab found in the northern Atlantic Ocean and North Sea. It may be found on sand and gravel in the sublittoral and lower littoral zones, down to a depth of 84 metres (276 ft), from the Azores and the Alboran Sea (the westernmost section of the Mediterranean Sea) as far north as the Shetland Islands. It reaches a carapace length of 35 millimetres (1.4 in), and is distinguished from other similar species by the presence of three similarly-sized teeth on the edge of the carapace, between the eyes, and by the marbled colouration on the carapace. L. marmoreus is sometimes parasitised by the barnacle Sacculina.
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- Cédric d'Udekem d'Acoz (2003). "Polybius marmoreus (Leach, 1814)". Crustikon – Crustacean photographic website. Tromsø Museum – University of Tromsø. Archived from the original on February 19, 2008. Retrieved September 3, 2007.
- "Crabs of the Southern North Sea". Sea Fisheries Department. October 8, 2001. Retrieved September 3, 2007.
- E. Wilson (November 10, 2006). "Marbled swimming crab - Liocarcinus marmoreus". Marine Life Information Network for Britain & Ireland. Retrieved September 3, 2007.
- M. J. de Kluijver & S. S. Ingalsuo. "Liocarcinus marmoreus". Crustacea: Macrobenthos of the North Sea. Universiteit van Amsterdam. Retrieved September 3, 2007.
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