Bythinella dimitrosensis, Glöer & Reuselaars, 2020

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

publication ID	https://doi.org/ 10.37828/em.2020.29.3
publication LSID	urn:lsid:zoobank.org:pub:873D27C2-1693-4E93-8313-D00B72F82B82
persistent identifier	https://treatment.plazi.org/id/EF2F837C-1918-4D16-917E-6EF5679958C1
taxon LSID	lsid:zoobank.org:act:EF2F837C-1918-4D16-917E-6EF5679958C1
treatment provided by	Felipe
scientific name	Bythinella dimitrosensis
status	sp. nov.

Treatment

Bythinella dimitrosensis View in CoL n. sp. [fig. 2.12]

Material examined: Holotype ( RMNH.MOL.340516) and 3 paratypes ( RMNH.MOL.340517) from type locality.

Holotype: 2.6 mm high, 1.6 mm broad from type locality.

Paratypes: 3 paratypes from type locality, 7 adult and 15 subadult ex. (dry) in coll. Robert Reuselaars (no. 776).

Locus typicus: Spring of Aghios Dimotros , island of Evia, Greece at 330 meters altitude ( Figure 5 View Figures 4-9 ), 38° 06' 29.05401'' N 24° 26' 12.21897'' E, 10.06.2011 Robert Reuselaars leg. GoogleMaps

Habitat: on small stones and old leaves, this species occupies an area of about 1 m 2.

Etymology: Named after Aghios Dinitros town.

Description: The shell is ovate with 4.5 slightly convex whorls which are separated by a clear suture. The apex is pointed. The aperture is oblique ovate, angled at the top. The peristome is thickened at the columella. The umbilicus is closed. The body whorl takes 0.77 of shell height. The aperture is 1.0 mm high and 0.8 mm broad. The ratio of shell height to shell width is 1.7. The shell is 2.4-2.7 mm high and 1.5- 1.7 mm broad.

Differentiating characters: B. dimitrosensis n. sp. is smaller than B. charpentieri and the whorls are less convex.

Distribution: Only known from type locality.

Conservation

Our contribution to the knowledge on the freshwater springsnails from Greece is important if we want to protect these species. Due to the human impact, most species in Greece are serious under stress. Most springs are used for drinking water or irrigation, see the examples in the figures 6, 7, 10, 12, 13 and 14. Another example: a short visit at the spring above Eftalopos 38° 35' 34.91509'' N 22° 30' 13.77271'' E (figure 15), after visiting the area around Nafpaktos and on the way to Athens in 2019, the type loacility of Daphniola eptalophos , showed a similar picture. This species lives in a small artificial basin of less than 0, 25 m 2. It is also serious under stress by pollution of the tobacco from cigarettes which were thrown in the small basin. Subsequently it seems that this spring is also drying out slowly. During the visit only two alive specimen were observed GoogleMaps .

Of the Bythinella sps which are described in this article, we consider the species kyriaki , pesici , radomani , righaensis , petrosensis , olymbosensis , liandianensis and dimitrosensis as critically endangered due to a single spring, tiny area where they live in and low numbers of specimen. The others are considered as endangered because they only live in one spring with a higher number of specimen and less chance of human disturbance.

1 Shell small, <2.5 mm,

– Shell larger than 2.5 mm

2 Shell about 2 mm high, peristome sharp, umbilicus closed, W- Peloponnese east of Nea Figalia

– Shell 2.1-2.3 mm high, N-Greece or S-Peloponnese

3 Whorls slightly convex, aperture angled at the top, peristome reflexed at the columella, near monastery Kapina, Epirus

– Whorls convex, aperture not angled, body whorl: shell height = 0.8, S-Peloponnese, spring between Liandina and Vasiliki

4 Shell elongated and slightly conical

– Spire not conical

5 Shell elongated ovate, S-Peloponnese, umbilicus slit-like

– Shell elongated ovate, S-Peloponnese, umbilicus closed

6 Shell higher than 3 mm,

– Shell 2.6-2.9 mm high