Bythinella reischuetzi Glöer & Georgiev, 2020

Georgiev, Dilian & Glöer, Peter, 2020, Three new hydrobiid species from Thassos Island (Greece) with a re-description of Amnicola charpentieri Roth, 1855, Ecologica Montenegrina 35, pp. 129-137 : 134-135

Bythinella reischuetzi Glöer & Georgiev n. sp. ( Figs. 2 , 18-21 )

https://zoobank.org/ urn:lsid:zoobank.org:act:5FFCFB24-AF6F-4625-9A57-70520A01B94D

Materials studied:

Holotype: shell height 2.5 mm, shell width 1.7 mm, ZSM Mol 20202395, coll. Roth.

Paratypes: numerous (> 150) specimens, ZSM Mol 20012100, coll. Roth.

Type locality: Greece, Párnis (Mountain) in Parnitha National Park.

Etymology: Named after Peter L. Reischütz (Vienna), outstanding expert on Hydrobiids of the Balkans, who already pointed out in 2008 (p. 35) that the Bythinella spp. of the Peleponnese is much more diverse than believed at that time.

Description: The ovate shell is thick-walled with 4-4.5 slightly convex whorls, separated by a clear suture. The first whorl lies in a plane and is not visible from frontal view. The aperture is ovate with a slight angle at the top. The peristome is thickened at the columella. The umbilicus is closed. The shell is 2.5 mm high and 1.7 mm broad.

Differentiating characters: The species differs from all other Bythinella spp. of Greece by the first whorl which lies in a plane. Thus the compressed shell shape is characteristic of this species.

Distribution: Only known from type locality.

Remark: In this region another Bythinella sp. occurred (see Fig. 15 ), distinct from B. reischuetzi n. sp. Unfortunately we do not know the exact locations because these have not been mentioned at the labels.

Figures

Figure 2. The sampling sites of the species under discussion on Thassos. 1: Rachoni village: type locality of Bythinella rachonica n. sp., localiy of Grossuana beroni n. sp.; 2: Drakotrype cave, Panagia village: localiy of Grossuana beroni n. sp.; 3: type localiy of Grossuana beroni; 4: type locality of Grossuana thasia n. sp., 5: Pernes Mountain, type locality of Bythinella reischuetzi n. sp., 6: Hymettos, type locality of Bythinella charpentieri (Roth, 1855).

Figs 18-21. Bythinella reischuetzi n. sp. 18: holotype, 19: original label, 20: paratype, 21: apical view.

Figures 11-17. Bythinella charpentieri, syntypes and others from colletions ZSM and SMF. 11: lectotype of B. charpentieri Roth, 1855 from Roth’s collection ZSM 20012106. 12: paralectotype, Hymettus, ZSM29912124, 13: topotype, Hymettus SMF141584, 14: Kessisos ZSM20012113, 15: Attika ZSM20012106, 16: Attika, ZSM20012110, 17: Parnes, SMF141838.