Spelaeodiscus unidentatus acutus Pall-Gergely & Feher, 2018

Pall-Gergely, Barna, Deli, Tamas, Eross, Zoltan Peter, Reischuetz, Peter L., Reischuetz, Alexander & Feher, Zoltan, 2018, Revision of the subterranean genus Spelaeodiscus Brusina, 1886 (Gastropoda, Pulmonata, Spelaeodiscidae), ZooKeys 769, pp. 13-48 : 13

Spelaeodiscus unidentatus acutus Pall-Gergely & Feher ssp. n. Figure 14A-L

Spelaeodiscus unidentatus - Reischütz et al. 2013: 62, fig. 3.

Type material.

Albania, rocks north of Hajmel at the bridge, north of Lezhe, 40 m a.s.l., 41°58.426'N, 19°38.683'E, leg. A. Reischütz, N. Reischütz & P. L. Reischütz, Apr. 2012, NHMW 112371/1 (photographed paratype, Fig. 14G-L ), REI/6 paratypes; Albania, rocks 1 km south of Hajmel, north of Lezhe, 50 m a.s.l., 41°56.848'N, 19°38.379'E, leg. A. Reischütz, N. Reischütz & P. L. Reischütz, Apr. 2012, REI/5 paratypes; Albania, Shkodër District, Vau i Dejës, Mjedë, near the dam, 45 m a.s.l., limestone rocks, 42°0.804'N, 19°37.188'E (site code: 2015/99), leg. Z.P. Erőss, Z. Fehér & J. Grego, 04 Jul. 2015, HNHM 103252 (holotype, SW: 2.9 mm, SH: 1.5 mm, Figs 14A-F ), NHMW 112372/1 paratype, JG/1 paratype.

Type locality.

Albania, Shkodër District, Vau i Dejës, Mjedë, near the dam, 45 m a.s.l., limestone rocks, 42°0.804'N, 19°37.188'E.

Diagnosis.

Basal tooth pointed; palatal part of peristome with slight incision at the position of the palatal tooth, palatal region not or slightly “pushed” from outside.

Measurements. SW: 2.9-3.5 mm (median = 3.0 mm), SH: 1.4-1.8 mm (median = 1.5 mm), AW: 1.1-1.3 mm (1.2 mm), AH: 1.1-1.4 mm (median = 1.2 mm), (n = 9; largest and smallest specimens of multiple populations measured).

Differential diagnosis.

Spelaeodiscus unidentatus acutus ssp. n. differs from the nominotypical subspecies by the strong, pointed basal tooth, which is blunt, or represented as a thickening of the basal peristome in the nominotypical subspecies. Moreover, the palatal region is not or only slightly “pushed” from the outside in the position of the palatal tooth. Rib density: 64-91 ribs on the body whorl.

Variation among specimens.

This subspecies is variable in terms of shell size and spire height, i.e. one population has a nearly flat shell.

Etymology.

This new subspecies is named after its pointed (Latin: acutus) basal tooth, which distinguishes it from the nominotypical subspecies.

Distribution.

This subspecies is known from the southeastern side of the Shkodër Lake Basin in Albania (Figure 7 ).

Figures

Figure 7. Distribution of Spelaeodiscus Brusina, 1886 species.

Figure 14. Shells of Spelaeodiscus. A-F Spelaeodiscus unidentatus acutus ssp. n., holotype (HNHM 103252) G-L Spelaeodiscus unidentatus acutus ssp. n., Albania, rocks north of Hajmel at the bridge (NHMW 112371) M-R Spelaeodiscus virpazarioides sp. n., holotype (HNHM 103417).