Bythinella reuselaarsi, Glöer & Pešić, 2020

Glöer, Peter & Pešić, Vladimir, 2020, Two new species of the genus Bythinella Moquin-Tandona, 1856 from the Greek island of Evia (Gastropoda: Bythinellidae), Ecologica Montenegrina 36, pp. 1-5 : 4

Bythinella reuselaarsi n. sp.

https://zoobank.org/ urn:lsid:zoobank.org:act:FD39E451-4938-40DE-BD06-DE100A94AA53

Figs 9-10

Material examined — Holotype ( ZMH140807 ): shell height 3.1 mm, width 1.9 mm; paratypes: 64 specimens in isopropanol ( ZMH140808 ), 15 specimens in coll. Glöer.

Type locality — Greece, Evia Island , the region of Mount Ochi, GR 4 limnocrene spring within Platanus grove along the road, near Melissonas village, 38°5'26.43"N, 24°23'54.97"E, 30.06.2007 leg. Pešić.

Etymology — Named after Robert Reuselaars (Assen, The Netherlands) in appreciation of his work in collecting Bythinella samples in Greece.

Description

Shell — Shell ovate-cylindrical with 4.5 slightly convex whorls separated by a deep suture. The aperture is ovate, somewhat oblique. The peristome is sharp. The umbilicus is closed. The shell is 3.1 mm high and 1.9 mm broad.

Anatomy — The penis is much shorter than the penial appendix. The tubular gland is thin at the proximal end and brod at the distal end ( Fig. 10 ), with six half-loops.

Differentiating characters — The shell of Bythinella reuselaarsi n. sp. is ovate-cylindrical, not elongated like in B. charpentieri . On the other hand, B. dimitrosensis can be distinguished from the new species by a smaller size, ovate shell. The body whorl of B. reuselaarsi n. sp. is convex and not straight like in B. kastanolongosensis n. sp. The tubular gland of B. reuselaaarsi n. sp. is longer (6 half-loops) vs. four half-loops in B. kastanolongosensis n. sp.

Habitat — Specimens were collected from a limnocrene spring with a well developed starwort ( Callitriche sp. ) vegetation ( Fig. 12 ).

Distribution — Greece; Only known from the type locality in the region of the Mt. Ochi in the southern part of the island of Evia.

Figures

Figures 2-10. 2: Bythinella charpentieri (lectotype), 3-5: B. dimitrosensis Glöer & Reuselaars, 2020a, 4: B. dimitrosensis from Evia Island, the region of Mount Ochi, Metochi spring; 5: B. dimitrosensis from Evia Island, the region of Mount Ochi, spring near Lenosei village; 6: B. kastanolongosensis n. sp. (holotype), 7: penis with tubular gland, 8: B. kastanolongosensis n. sp. (paratype), 9: B. reuselaarsi n. sp., 10: penis with tubular gland.

Figures 11-12. Photographs of sampling site. 11: GR15 heleocrene spring in old-growth chestnut wood, Kastanolongos, locus typicus of Bythinella kastanolongosensis n. sp. 12: GR4 limnocrene spring near Melissonas, locus typicus of B. reuselaarsi n. sp. Photos: V. Pešić.