EN
The diploid chromosome set of Arion vulgaris Moquin-Tandon consists of 52 chromosomes, with the karyotype formula: 2n = 44m+6sm+2st=52; FN = 104. The chromosome number (n = 26, 2n = 52) of A. vulgaris is identical to that of A. subfuscus sensu lato, A. ater (L.) and A. rufus (L.) which may suggest their close relationship.