Charpentieria dyodon thomasiana ( Kuester , 1850)

De Mattia, Willy, Reier, Susanne & Haring, Elisabeth, 2021, 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), ZooKeys 1077, pp. 1-175 : 1

Charpentieria dyodon thomasiana ( Kuester, 1850)

Figs 41.1-41.4, 42.3, 42.4

Specimens examined.

Italy, Piedmont, Biella, Santuario di Oropa. 1100 m asl 45°37'49.01"N, 07°58'42.07"E, W. De Mattia and J. Macor leg. and det., 3 dissected spm . Italy, Piedmont, Biella, Sentiero per Pra del Vecia , Piedicavallo. 1200 m asl, 45°41'32.37"N, 07°58'2.37"E, leg. and det., 2 dissected spm .

Distribution.

Charpentieria dyodon thomasiana is found in the surroundings of Oropa and Piedicavallo, surroundings of Biella (Piedmont).

External morphology of the genital organs

(Fig. 41 .1, 41.3). The FO is half as long as the V. The FDBC is shorter than the BC+SDBC (SDBC+BC). The BC+SDBC is club-like and longer than the V with slight distinction between the SDBC and the BC. The apex is pointed. The D is slightly longer than the BC+SDBC, thinner with a round apex. The V is long and cylindrical. The PC is longer than the V. The PR is long and robust. The E is slightly shorter than the P and thin.

Internal morphology of the genital organs

(Fig. 41 .2, 41.4). 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, elongated with a pointed 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.

Brief genital anatomical description of the subspecific taxa of Charpentieria ornata and Charpentieria itala

The Southern Alpine C. itala is distributed from Como Lake to the Garda Lake, Trentino, Veneto (including Colli Berici and Colli Euganei) and the Pre-Alps of Friuli. Nordsieck (1963b) provided, for the eastern border of its distribution, the axis Pordenone-Ampezzo. Recent collecting extended its eastern distribution as far Udine and Cividale in Friuli (WDM, personal unpublished data). Its eastern distribution range overlaps with C. stenzii and in few localities they are found syntopic (e.g., San Romedio, Trento, where C. stenzii stenzii and C. itala serravalensis are found syntopic). Concerning the nomenclature of C. itala , we adopted the system by Scheel and Hausdorf (2012) that considered C. clavata as a subspecies of C. itala .

Its shell is weakly striated to frankly ribbed, with evident sutural papillae and a strong lunella, which is remarkably curved. Twelve out of the seventeen currently valid subspecies of C. itala were anatomically investigated, revealing a common overall arrangement of the genital organs. The pseudopapilla can be either smooth or markedly wrinkled and occupies almost the whole penial volume.

Figures

Figure 41. Charpentieria dyodon thomasiana (Kuester, 1850), Piedicavallo 41.1 whole distal genital organs 41.2 internal distal part of genital organs. Oropa, Biella 41.3 whole distal genital organs 41.4 internal distal part of genital organs.