Bythiospeum blihensis, Glöer & Grego, 2015

Glöer, Peter & Grego, Jozef, 2015, New subterranean freshwater Molluscs from Bosnia & Hercegovina (Mollusca: Hydrobiidae), Ecologica Montenegrina 2 (4), pp. 307-314 : 309-310

Bythiospeum blihensis n. sp.

( Figs 8-12)

Holotype: shell height 3.1 mm, width 1.3 mm, HNHM 99421 .

Paratypes: 4 specimen + some broken shells, HNHM 99422 ; 2 specimen in coll. Glöer; 3 specimens in coll Grego.

Locus typicus: Bosnia & Hercegovina , Bosnian Federation , Bihać district, Donji Kamengrad, about 1 km S of crossing from road R405 direction below quarry, about 250 m from last houses at S side of the village. Spring at left side of old dry canyon of Bliha (situated about 1 km south from the active canyon), a small spring among bushes and vegetation with small rocky cascades reaching the meadow. On the meadow at valley bottom is a small rock ring supported well where had been detected the same species. Sandy sediment from spring zone (1) and from well (2): N44.779470°, E16.566431° (spring) and N44.779547°, E16.566860° (well) ; Jozef and Maroš Grego leg., 04. 04.2015.

Etymology: Named after rivulet Bliha which formed the dry canyon with the type locality and recently draining the active canyon about 1km north.

Description

Shell. The whitish and silky shell is elongate-conic with 5.5-6 convex whorls separated by a deep sutur, apex blunt. The umbilicus is slit-like, aperture oval, slightly sinuated outer lip from lateral view. Shell height 2.9–3.1 mm, width 1.3 mm.

Differentiating features: Bythiospeum blihensis n. sp. is the largest species of the here described species, only B. plivensis n. sp. is similar in size but B. plivensis n. sp. has a very large aperture.

Distribution: Only known from type locality.

Associated species: Sadleriana sadleriana (Frauenfeld, 1863) , Lanzaia bosniaca Bole, 1970 , Belgrandiella fontinalis (F.J. Schmidt, 1847) , Radix labiata (Rossmaessler, 1835) , Pisidium casertanum Poli, 1791 ), Hauffenia sp.