Establishment of a new alien species in Lake Maggiore (Northern Italy):Anodonta (Sinanodonta) woodiana (Lea, 1834) (Bivalvia: Unionidae)

This note is the first communication of the occurrence of the alien Anodonta (Sinanodonta) woodiana (Lea, 1834) (Bivalvia: Unionidae) in Lake Maggiore (Northern Italy). We have found empty shells of the bivalve first in August 2010, and since then, this species is colonizing rapidly the second deepest subalpine lake in Italy. Preliminary findings on morphometric features of A. woodiana in the Lake are provided.