Stigmatica stigmatica sturmii (L. Pfeiffer, 1848)

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 stigmatica sturmii (L. Pfeiffer, 1848)

Figs 60.1, 60.2, 61.4

Distribution.

This taxon is restricted to the Salento (Puglia, Italy) and central Albania with the type form ( Nordsieck 2013a: 6).

Specimens examined:

Italy, Puglia, Brindisi, Punta Penne next to the Airport. 5 m asl, 40°40'31.60"N, 17°56'40.44"E, [Lab ID 12194_1, COI: MW758949 , ITS2: MW757053, MW757054 ; Lab ID 12194_2, COI: MW758950 ], H. Nordsieck leg. and det. 2 dissected spm .

External morphology of the genital organs

(Fig. 60 .1). The V is shorter than the FO. The FDBC is longer than the SDBC+BC. The BC+SDBC is club-like in shape, with a more or less clear distinction between the SDBC and the BC. The D is much longer than the SDBC+BC and slightly thinner. The V is moderately long and thin in diameter. The PC is ~ 2 × longer than the V. The P is slim and cylindrical. The transition between P and EP is not visible. The PR is long and robust. The E is shorter than the P and thinner in diameter.

Internal morphology of the genital organs

(Fig. 60 .2). The V is smooth. The P shows a single smooth longitudinal pleat that reaches the atrium. The pseudopapilla is elongated with an irregular surface. It originates from the E wall. The epiphallar formula is PP+ELP. The E shows two smooth ELP. They proximally fade before the VD.

Remarks.

The morphology of the genital organs of this population is remarkably different from all other Stigmatica , and it shows high affinity with the genus Gibbularia . This is also suggested by the ITS2 tree, where G. gibbula gibbula from Apricena and this population cluster together implying that this population might were misidentified and belongs to the genus Gibbularia . However, in the COI tree, S. s. sturmii forms a very distant lineage. Thus, this taxon certainly deserves thorough investigation with a larger sample size.

Figures

Figure 60. Stigmatica stigmatica sturmii (L. Pfeiffer, 1844), Punta Penne, Brindisi 60.1 whole distal genital organs 60.2 internal distal part of genital organs. Stigmatica ernae Fauer, 1978, San Rufo, Passo Sentinella 60.3 whole distal genital organs 60.4 internal distal part of genital organs. Stigmatica incerta (Kuester, 1861), Serra San Bruno, Vibo Valentia 60.5 whole distal genital organs 60.6 internal distal part of genital organs. Stigmatica kobeltiana (Kuester, 1876). Altilia, Cosenza 60.7 whole distal genital organs. 60.8 internal distal part of genital organs; Gerace 60.9 whole distal genital organs 60.10 internal distal part of genital organs; Amantea, Cosenza 60.11 whole distal genital organs 60.12 internal distal part of genital organs. Stigmatica lamellata (Rossmaessler, 1836), Corfu, Greece 60.13 whole distal genital organs. 60.14 internal distal part of genital organs 60.15 cross section of the epiphallus.