Non-indigenous freshwater crabs in France: a new occurrence of a potamid near Nice
The presence of a crab in the Cagne River, in south-eastern France near Nice (Alpes-Maritimes), has been known since about 1985 (M. Pascal 2000, personal communication). A brachyuran crab of the genus Potamon Savigny, family Potamidae Ortmann, referred to by locals as the “blue crab”, was first observed in 2000 ( J.-L. Teyssié 2002, personal communication) and then collected in this river in 2000 and the following years. The occurrence of the crab was confirmed in 2005 by new field observations by one of us (P. Noël) and also documented by canyoning enthusiasts and fishermen. This crab is totally dependent on freshwater, even if it is located not very far from the sea (about 10 km); it shows a direct development without freeswimming larvae and has no recognizable close relatives in the sea.
KeywordsBlue Crab Carapace Width Freshwater Crab Aegean Island Brachyuran Crab
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