Less rare than we thought: two new localities for Piseinotecus soussi Tamsouri, Carmona, Moukrim & Cervera, 2014 along the Tyrrhenian coast. two new localities for Piseinotecus soussi Tamsouri, Carmona, Moukrim & Cervera, 2014 along the Tyrrhenian coast

The geographic range of Piseinotecus soussi Tamsouri, Carmona, Moukrim & Cervera, 2014 is here updated, since it was found in two new localities along the Tyrrhenian coast of the Mediterranean Sea. This species was previously recorded in Mediterranean basin only from the Ionian Sea (Apulia). With this paper, the range of distribution of this aeolid sea slug is considerably extended. Furthermore, to confirm the identity of specimens recorded, a DNA Barcoding approach was carried out using the mitochondrial Cytochrome c oxidase subunit I (COI) as it is the mostly used barcoder marker in Nudibranchs.