Two new species of the genus Bythinella Moquin-Tandona, 1856 from the Greek island of Evia (Gastropoda: Bythinellidae) Author Glöer, Peter Biodiversity Research Lab, Schulstrasse 3, D- 25491 Hetlingen, Germany. E-mail: gloeer @ malaco. de Author Pešić, Vladimir Department of Biology, Faculty of Sciences, University of Montenegro, Cetinjski put b. b., 81000 Podgorica, Montenegro. E-mail: vladopesic @ gmail. com text Ecologica Montenegrina 2020 2020-11-01 36 1 5 http://dx.doi.org/10.37828/em.2020.36.1 journal article 10.37828/em.2020.36.1 2336-9744 13232063 urn:lsid:zoobank.org:pub:1878F3DE-C9F8-4D7F-B562-73A99B9C552B 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.