The exotic crab Percnon gibbesi (H. Milne Edwards, 1853) (Decapoda, Grapsidae) in the Central Mediterranean

The grapsid crab Percnon gibbesi (H. Milne Edwards, 1853), not previously recorded in the Mediterranean, has been found by underwater observations in several localities of Linosa, Pelagie Islands, (Italy). This presence increases the list of alien Decapods in the Mediterranean, with a form which can be considered a western migrant.