Bythiospeum maroskoi, Glöer & Grego, 2015

Glöer, Peter & Grego, Jozef, 2015, New subterranean freshwater Molluscs from Bosnia & Hercegovina (Mollusca: Hydrobiidae), Ecologica Montenegrina 2 (4), pp. 307-314 : 311

Bythiospeum maroskoi n. sp.

( Figs 18-22)

Holotype: shell height 2.1 mm, width 1.0 mm, HNHM 99425 .

Paratypes:> 100 specimens in ethanole,> 100 specimens empty shells, HNHM 99426 , 2 specimen in coll. Glöer, 30 specimens in coll. Grego.

Locus typicus: Republika Srpska in region of Banja Luka, in a karst spring 500 m S of Gornja Pećka, on road from Donji Barači to Izvor Sana, 2 km before bridge over Sana near travertine waterfall cascades, among houses 350 m W of cascades. Spring coming from several sites under limestone cliffs, few springs caught to wells for tap water supply. The small settlement with several old watermills is situated on travertine platform ca. 4 m above the valley. Sandy sediment at the middle spring; N44.307255°, E16.899490°; 05.04.2015, Jozef & Maroš Grego leg. ( Figs. 2, 3).

Etymology: Named after Maroš (Maroško) Grego, young enthusiastic documentarist of the Balkans, son of junior author, who helped to collect the species within the field trip.

Description

Shell. The whitish and silky shell is elongate-conic with 5.5 convex whorls and deep suture, apex blunt. The umbilicus is slit-like, aperture nearly oval, slightly sinuated outer lip from lateral view. Shell height 2.3–2.5 mm, width 1.0– 1.1 mm.

Anatomy. The penis is triangular, distally pointed.

Differentiating features: Bythiospeum maroskoi n. sp. is smaller than B. blihensis n. sp. and B. plivensis n. sp. In B. hrustovoensis n. sp. the axis of the aperture is inclined while it is in B. maroskoi n. sp. vertical. From B. petroedei n. sp. it differs in the embryonic shell, which ratio of the first half whorl to first whorl is in B. maroskoi n. sp. 0.5 and in B. petroedei n. sp. 0.75.

Distribution: Only known from type locality.

Associated species: Sadleriana sadleriana (Frauenfeld, 1863) , Belgrandiella fontinalis (F.J. Schmidt, 1847) , Ancylus fluviatilis O.F. Müller, 1774 , Islamia steffeki n. sp.