New data on the distribution and molecular diagnostics of Monacha claustralis (Rossmässler, 1834) and M. cartusiana (O. F. Müller, 1774) (Gastropoda: Eupulmonata: Hygromiidae) in Poland, Bosnia and Serbia

the study provides new distributional data on Monacha claustralis (Rossmässler) and M. cartusiana (O.F. Müller) which invaded Poland in the last five decades.Both species were identified based on two mitochondrial gene sequences (COI and 16SrDNA) and the genital structure.M. cartusiana, discovered in Poland in the early 1970s, is still limited to a few localities in Wrocław (Dolnośląskie Province), but the recent records from the environs of Kielce (Świętokrzyskie Province) suggest that the species is expanding its range.The occurrence of M. cartusiana in Bosnia and Herzegovina and in Serbia was confirmed by molecular analysis.M. claustralis, discovered in Poland in the early 2000s, but only very recently correctly identified, turned out to be very invasive.Its new populations were discovered in southern (Świętokrzyskie Province), western (Wielkopolskie Province), central (Kujawsko-Pomorskie Province) and northern (Pomorskie Province) Poland.Distribution maps of the two species in Poland are provided, and the new sequences of their COI and 16SrDNA genes have been deposited in GenBank.