Forty-seven years later: the blue crab Callinectes sapidus Rathbun, 1896 (Crustacea Decapoda Portunidae) reappears in the Strait of Messina (Sicily, Italy)

The second record of the invasive blue crab Callinectes sapidus Rathbun, 1896 (Crustacea Decapoda Portunidae) from the Strait of Messina has been reported, forty-seven years after the first record in this area. The specimen, a large-sized adult female, was collected in the Capo Peloro Lagoon, a natural reserve whose brackish waters represent a highly favorable environment for this euryhaline opportunistic species. The actual possibility that C. sapidus may settle in the Lagoon should be carefully evaluated, and a mitigation strategy, involving selective removal of pioneer specimens, timely envisaged.