Stigmatica vulcanica sigridae Nordsieck, 2013

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

Stigmatica vulcanica sigridae Nordsieck, 2013

Figs 65.7, 65.8, 66.4, 66.5

Distribution.

Stigmatica vulcanica sigridae is restricted to a small range east of Cosenza in central Calabria ( Nordsieck 2013a: 10).

Specimens examined.

Italy, Calabria, Cosenza, Contrada Rizzuto. 770 m asl, 39°14'51.24"N, 16°10'30.51"E, W. De Mattia and J. Macor leg. and det., 2 dissected spm ; Italy, Calabria , Cosenza, Contrada Rizzuto road to San Bartolo , Cosenza, Calabria , Italy. 740 m asl, 39°15'20.65"N, 16°11'09.16"E, W. De Mattia and J. Macor leg. and det., 2 dissected spm .

External morphology of the genital organs

(Fig. 65 .9). The V as long as the FO. The FDBC is 1.5 × longer than the SDBC+BC. The BC+SDBC is club-like in shape, with a clear distinction between the SDBC and the BC. The D is much longer than the SDBC+BC and remarkably thinner. The V is wide in diameter. The PC is ~ 2.5 × longer than the V. The P is cylindrical and slightly swollen. The transition between P and EP is clearly visible with a strong ET. The PR is short and robust. The E is longer than the P but thinner in diameter.

Internal morphology of the genital organs

(Fig. 65 .10). The V shows a weak longitudinal sculpturing. The P shows 6 to 8 smooth longitudinal pleats that fade as entering into the A. The pseudopapilla is smooth and short. It originates from the ER which is connected to the ELP by means of three or four smooth longitudinal pleats. The two ELP are slightly fringed and fade before entering the VD. The epiphallar formula is PP(ER)+ELP.

Remarks.

Stigmatica vulcanica sigridae was described based on shell characters that slightly differ from the nominate subspecies ( Nordsieck 2013a: 10). Its anatomy of the genital organs, except for the smooth (instead of fringed) longitudinal penial pleats, matches with the nominate subspecies populations from Calabria but nevertheless keeps reliable differences with the Sicilian samples.

Figures

Figure 65. Stigmatica vulcanica vulcanica (Benoit, 1860), Belpasso, Catania 65.1 whole distal genital organs 65.2 internal distal part of genital organs. Cosenza 65.3 whole distal genital organs 65.4 internal distal part of genital organs. Paola 65.5 whole distal genital organs 65.6 internal distal part of genital organs. Stigmatica vulcanica sigridae Nordsieck, 2013, Mendicino, Cosenza 65.7 whole distal genital organs 65.8 internal distal part of genital organs.