Spelaeodiscus hunyadii Pall-Gergely & Deli, 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 hunyadii Pall-Gergely & Deli sp. n. Figure 10A-E

Type material.

Montenegro, SE of Virpazar, 4.3 km (in a straight line) SSE of Ðuravci, near Besa/Bes near Krone i Besit, 330 m a.s.l., 42°08.548'N, 19°13.165'E (site code: 20171019G), leg. T. Deli, Z.P. Erőss, A. Hunyadi & B. Páll-Gergely, 19.10.2017, HNHM 103210 (holotype, SW: 2.1 mm, SH: 1.2 mm, Fig. 10A-E ), DT/40 paratypes, EZP/40 paratypes, HA/40 paratypes, HNHM 103211/3 paratypes, PGB/40 paratypes, NMBE 554178/3 paratypes, NHMW 112367/4 paratypes; Montenegro, Donji Murići junction S 2 km along the Virpazar-Ostros road, 320 m a.s.l., 42°8.544'N, 19°13.182'E (site code: 2017/009), leg. Z.P. Erőss & Z. Fehér, 16.07.2017, HNHM 103212/3 paratypes, EZP/3 paratypes.

Type locality.

Montenegro, SE of Virpazar, 4.3 km (in a straight line) SSE of Ðuravci, near Besa/Bes near Krone i Besit, 330 m a.s.l., 42°08.548'N, 19°13.165'E.

Diagnosis.

A small, nearly flat species with strong, widely spaced ribs, glossy protoconch and strongly oblique, toothless aperture.

Description.

Spire somewhat elevated; protoconch consists of 1.25-1.5 whorls, smooth, glossy; teleoconch with very strong (thick), equidistant, widely spaced ribs; rib density: 42-48 ribs on body whorl; between main ribs some fine wrinkles discernible; entire shell with 3.5-3.75 whorls; aperture semilunar, toothless, strongly oblique to shell axis; peristome slightly thickened and expanded in direction of umbilicus; umbilicus funnel-shaped, relatively narrow.

Measurements. SW: 2.1-2.2 mm (median = 2.2 mm), SH: 1.2-1.3 mm (median = 1.2 mm), AW: 0.8-0.9 mm (median = 0.9 mm), AH: 0.6-0.7 mm (median = 0.7 mm), AA = 47-52°(n = 4; largest and smallest specimens measured).

Differential diagnosis.

Spelaeodiscus obodensis has a more conical shell and roughly sculptured protoconch. The most similar species to Spelaeodiscus hunyadii sp. n. is S. dejongi , which lives sympatrically with the new species. It differs from Spelaeodiscus hunyadii sp. n. in the less oblique aperture and the denser ribs. Some other populations of S. dejongi also possess widely spaced ribs, but their aperture is less oblique, thus, they can be distinguished from this new species. See also under S. latecostatus sp. n.

Variation among specimens.

Specimens of the type sample show no notable conchological variability.

Etymology.

This new species is named after our colleague and friend, András Hunyadi, who is one of those who first collected this species.

Distribution.

This species is known from the type locality only (Figure 7 ).

Conservation status.

To our present knowledge this species is very rare (currently known from a single location) and thus AOO is smaller than 20 km2. However, there is no reason to suppose that AOO, EOO, number of locations, number of subpopulations or the number of mature individuals are declining or extremely fluctuating. Therefore, it might be assessed as Near Threatened (NT).

Figures

Figure 7. Distribution of Spelaeodiscus Brusina, 1886 species.

Figure 10. Shells of Spelaeodiscus Brusina, 1886 species. A-E Spelaeodiscus hunyadii sp. n., holotype (HNHM 103210) F-J Spelaeodiscus latecostatus sp. n., holotype (HNHM 103214) K-O Spelaeodiscus cf. latecostatus sp. n., Montenegro, Seoca S 1 km (HNHM 103213).