The Bythinella spp. of Greece (Gastropoda: Hydrobioidea: Bythinelliidae) Author Glöer, Peter Schulstrasse 3, D- 25491 Hetlingen, Germany; e-mail: gloeer @ malaco. de Author Reuselaars, Robert Traverse 33, 9408 MG Assen, The Netherlands; e-mail: f 2 hreuselaa @ hetnet. nl text Ecologica Montenegrina 2020 2020-03-14 29 2020 20 33 http://dx.doi.org/10.37828/em.2020.29.3 journal article 10.37828/em.2020.29.3 2336-9744 urn:lsid:zoobank.org:pub:873D27C2-1693-4E93-8313-D00B72F82B82 Bythinella gregoi n. sp. [fig. 2.2] Material examined: Holotype ( RMNH .MOL.340496) and 2 paratypes ( RMNH .MOL.340497) from type locality. Holotype : 2.5 mm high, 1.4 mm broad from type locality. Paratypes : 2 paratypes from type locality, 2 adult and 5 subadult ex. in coll. Robert Reuselaars (no. 839). Locus typicus: Spring SW of Anthousa , Greece , at 1.000 meters altitude, 39° 39' 31.97786'' N 21° 12' 27.76905'' E , 09.05.2013 Robert Reuselaars leg. Habitat: Slow running spring, the specimen were collected from old leaves. Etymology: Named after Jozef Grego who did so much for our knowledge of the hydrobiids from the Balkan. Description: The shell is slim ovate with 4-4.5 slightly convex whorls which are separated by a clear suture. The aperture is ovate, slightly angled at the top. The peristome is broadened at the columella. The umbilicus is slit-like. The aperture is 0.8 mm high and 0.7 mm broad. The ratio of shell height to shell width is 1.7. The shell is 2.4-2.7 mm high and 1.4-1.5 mm broad. Differentiating characters: See Bythinella kyriaki n. sp. Distribution: Only known from type locality.