Charpentieria stenzii westerlundi Nordsieck, 1993

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 stenzii westerlundi Nordsieck, 1993

Figs 55.6, 55.7, 56.8

Distribution.

Charpentieria stenzii westerlundi is known only from Val Fiscalina (Fischleintal) in the surrounding of Sesto (Bolzano, Trentino-Alto Adige), Italy ( Nordsieck 1963b: 196).

Specimens examined.

Italy, Trentino-Alto Adige, Bolzano, Sesto, Val Fiscalina (Fischleintal), Croda Rossa. 1500 m asl, 46°38'2.83"N, 12°021'42.79"E, I. Niero leg. and det., 2 dissected spm .

External morphology of the genital organs

(Fig. 55 .6). The V is much shorter than the FO. The FDBC is as long as 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 short but 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. The PR is long and robust. The E is longer than the P but thinner in diameter.

Internal morphology of the genital organs (Fig. 55 .7).

The V is smooth. The P shows three to four irregularly fringed pleats that continue as far as the A. The hemipapilla is very short, conical and moderately folded. The outlet of the hemipapilla is triangular. The E shows two fringed ELP. They proximally fade before the VD.

Remarks.

The original name of this "Form vom Fischleintal in Südtirol” ( Nordsieck 1993: 36) namely Clausilia cincta var. disjuncta Westerlund, 1878, is pre-occupied by Clausilia disjuncta Mortillet, 1854 [= Armenica disjuncta (Mortillet, 1854)]. The new name Charpentieria stenzii westerlundi nom. nov. was provided by Nordsieck (1993: 36).

Brief genital anatomical description of three Gibbularia gibbula subspecific taxa

Gibbularia is a monotypic genus, currently considered both as a subgenus of Siciliaria ( Nordsieck 2007; Nordsieck 2013a) or a subgenus of Charpentieria (MolluscaBase 2021).

MolluscaBase eds. (2021) citation is based on Nordsieck (2002: 29) and the information provided by Nordsieck’s papers of 2007 and 2013a have never been subsequently adopted. The (sub)genus was briefly reviewed by Nordsieck (2013a: 6). The diagnosis is shell-based and the genus is subdivided into two main groups of species as seen in Table 9 . Charpentieria (Gibbularia) gibbula honii (O. Boettger, 1879) differs from the Charpentieria (Gibbularia) gibbula gibbula ( Rossmässler, 1836) by virtue of a few details of the buccal armature and shape of the clausilium ( Nordsieck 2013a: 6). Although considered as a subgenus of Siciliaria by Nordsieck (2013a: 4) highlighted the lack of the epiphallar thickening in Gibbularia .

In our study, two populations of Gibbularia gibbula gibbula underwent molecular genetic analysis and genital anatomical investigations, one from northern Italy: Muggia (Trieste) and one from Southern Italy: Apricena (Foggia) (Table 10 ). Their genital morphology is similar, with only slight differences such as the sculpturing of the internal penis (finely granulated vs. finely granulated + 1 weak smooth longitudinal pleats) and the presence of a weak epiphallar ring in the Apricena’s population. Both populations show a pseudopapilla directly originating from the epiphallar wall. Gibbularia gibbula cf. sanctangeli (not in the phylogenetic trees) from Gargano was also dissected and shows a remarkable different anatomy of the genital organs compared to the previous taxon. It shows an epiphallar ring that is connected to the ELP and also represents the origin of the pseudopapilla. In the mt tree, phylogenetic relationships among Gibbularia and the other genera, appear as a polytomy and low support values prevent us to provide any reliable statement. In the ITS2 tree, its distance from Charpentieria appears clear, preventing us to consider Gibbularia as a subgenus of Charpentieria as once listed by Nordsieck (2007).

Gibbularia until now was considered as a subgenus of Gibbularia Siciliaria (MolluscaBase 2021; Nordsieck, 2013a). Our results indicate that no Gibbularia sample falls inside Siciliaria / Sicania subclades, suggesting a meaningful phylogenetic distance. Its position inside Siciliaria cannot be maintained, albeit its relationships with the other genera (mainly with Stigmatica ), are still not clear. For this reason, we currently consider Gibbularia a valid genus until further results will be available.

Figures

Figure 55. Charpentieria stenzii nordsiecki Fauer, 1991, Cison di Valmarino, Treviso 55.1 whole distal genital organs 55.2 internal distal part of genital organs. Charpentieria stenzii paroliniana (De Betta & Martinati, 1855), Valstagna, Vicenza 55.3 whole distal genital organs 55.4 detail of the hemipapilla: uncut 55.5 internal distal part of genital organs with cut funnel. Charpentieria stenzii westerlundi Nordsieck, 1993, Val Fiscalina, Bolzano 55.6 whole distal genital organs 55.7 internal distal part of genital organs with cut funnel.