Morphological investigation of genital organs and first insights into the phylogeny of the genus Siciliaria Vest, 1867 as a basis for a taxonomic revision (Mollusca, Gastropoda, Clausiliidae) Author De Mattia, Willy https://orcid.org/0000-0002-0056-467X Central Research Laboratories, of Natural History Museum Vienna, Burgring 7, 1010 Vienna, Austria willy.demattia@icgeb.org Author Reier, Susanne Central Research Laboratories, of Natural History Museum Vienna, Burgring 7, 1010 Vienna, Austria Author Haring, Elisabeth Central Research Laboratories, of Natural History Museum Vienna, Burgring 7, 1010 Vienna, Austria text ZooKeys 2021 2021-12-14 1077 1 175 http://dx.doi.org/10.3897/zookeys.1077.67081 journal article http://dx.doi.org/10.3897/zookeys.1077.67081 1313-2970-1077-1 C28AD65A76F242CFBED7DFB3702CABCE 734088641608531C8E2CC69397B000ED Charpentieria dyodon alpina (Stabile, 1859) Figs 40.3-40.4, 42.2 Distribution. Charpentieria dyodon alpina is found in scattered populations along the Val di Lanzo, NW of Torino (Piedmont). Specimens examined. Italy , Piedmont , Torino , Margone , Val di Lanzo , Usseglio. 1500 m asl , 45°14'4.89"N , 07°12'18.90"E , leg. and det., 2 dissected spm . External morphology of the genital organs (Fig. 40 .3). The FO is almost as long as the V. The FDBC is slightly shorter than the BC+SDBC (SDBC+BC). The BC+SDBC is cylindrical and longer than the V with no clear distinction between the SDBC and the BC. The apex is round. The D is shorter than the BC+SDBC, thinner with a round apex. The V is as long as the first duct of the BC+SDBC. The PC is 2 x as long as the V. The PR is long and robust. The E is slightly longer than the P and thin. Internal morphology of the genital organs (Fig. 40 .4). The A and the P are smooth, with a very fine granulated sculpturing. The V shows many smooth longitudinal pleats. The smooth simple PP is simple, big, club-like with a round apex. Its base is partially connected to the ELP and transversally extends along the transition wall, narrowing the transition passage. The epiphallar formula is: PP(ELP). The E shows two main longitudinal moderately fringed pleats that proximally fade before the VD.