Bythinella olymbosensis, Glöer & Reuselaars, 2020

Glöer, Peter & Reuselaars, Robert, 2020, The Bythinella spp. of Greece (Gastropoda: Hydrobioidea: Bythinelliidae), Ecologica Montenegrina 29 (2020), pp. 20-33 : 29

Bythinella olymbosensis n. sp. [fig. 2.11]

Material examined: Holotype ( RMNH.MOL.340514) and 3 paratypes ( RMNH.MOL.340515) from type locality.

Holotype: 2.6 mm high, 1.7 mm broad from type locality.

Paratypes: 3 paratypes from type locality, 3 adult and 8 subadult ex. (dry) in coll. Robert Reuselaars (no. 754).

Locus typicus: Spring at Olymbos mountain , apr 3 km before the top, south Lesvos isl., Greece at 804 meters altitude ( Figure 12 ), 39° 04.15127' N 26° 21.01430' E, 08.05.2007 Robert Reuselaars leg.

Habitat: On algae on the bottom and sides of an artificial basin, this species occupies an are of less than 0, 25 m 2.

Etymology: Named after Olymbos mountain.

Description: The shell is ovate conical with 4.5-5 slightly convex whorls which are separated by a clear suture. The aperture is ovate, slightly angled at the top. The peristome is thickened at the columella. The umbilicus is closed. The body whorl takes 0.75 of shell height. The aperture is 1.0 mm high and 0.8 mm broad. The ratio of shell height to shell width is 1.6. The shell is 2.1-2.6 mm high and 1.4-1.7 mm broad.

Differentiating characters: No other Bythinella sp. known on this island.

Distribution: Only known from type locality.

Figures

Figures 10-14: Sampling sites. 10. Aghios Petros (type locality of Bythinella petrosensis n. sp.), 11. Monia Konstadinou (type locality of Bythinella konstandinensis n. sp.), 12. Olymbos mountain (type locality of Bythinella olymbosensis n. sp.), 13. Kokinochori (type locality of Bythinella radomani n. sp.), 14. N. of Klima (type locality of Bythinella pesici n. sp.), 15: spring above Eftalophos (type locality of Daphniola eptalofos).