Plagigeyeria feheri Grego and Glöer, 2019

Grego, Jozef, Glöer, Peter, Falniowski, Andrzej, Hofman, Sebastian & Osikowski, Artur, 2019, New subterranean freshwater gastropod species from Montenegro (Mollusca, Gastropoda, Moitessieriidae, and Hydrobiidae), Ecologica Montenegrina 20 (2019), pp. 71-90 : 84-85

Plagigeyeria feheri Grego and Glöer n. sp.

( Figs. 35–39 )

Type locality

Montenegro: Herceg Novi , Savina , below Savina Monastery under Braće Grakalić street at Meljine Hospital, behind neonatal pavilion, 42.451656°N; 18.555225°E, ( Fig. 2A ) .

Type material

Holotype: Type locality, J. Grego leg., 26.07.201 6 ( HNHM 103046 ) . Paratypes: same data (col. Gloer 1, coll. Grego /8) ; same data, Z. P. Erőss and Z. Fehér leg. , 16.07.201 8 ( HNHM 104183 /17, coll. Grego /10, collection Erőss /10) .

Measurements

Holotype: H 1.50 mm; W 0.78 mm; BH 0.88 mm; BW 0.66 mm; AH 0.56 mm; AW 0.51 mm.

Etymology

Named after Hungarian malacologist and friend Zoltán Fehér, curator of the malacological collection of Hungarian Natural History Museum, Budapest to acknowledge his substantive work on the gastropod fauna of the Balkans.

Description

Shell small, 1.5 mm high, with four convex whorls separated by a deep suture, oval-elongated in shape, with blunt apex and corneous-yellowish color. Surface shiny, very finely axially ribbed, covered by small incrustation spots from precipitated calcium carbonate. Umbilicus closed. Proportionately large oval aperture with conspicuously reflected margins. Outer lip weakly sinuated sinuous at columellar margin in lateral view. Expanded labral margin protrudes from body whorl in frontal (apertural) view.

Differentiating features

This is the smallest known Plagigeyeria species (1.50 mm). Compared to the geographically close Plagigeyeria zetaprotogona pageti forma minor Schütt, 1961 ( Montenegro, Risan) ( Figs. 31–31 ), the new species differs by its much smaller, more slenderer elongated subcylindrical shape with less conspicuous axial ribbing, by the more closed umbilicus as well as by the different shape of the aperture and the weakly sinuated labral margin ( Tab. 4). The overall shell shape of the new species resembles Plagigeyeria plagiostoma (A.J. Wagner, 1914) from Vrelo Bosne near Ilidža, but the new species differs by more small, oval and slender shell with its hidden umbilicus.

Habitat

See Stygobium hercegnoviensis n. sp.

Distribution

Known only from the type locality, where it was found with the Stygobium hercegnoviensis n. sp.

Figures

Figure 2. Photographs of studied localities: A. Montenegro: Herceg Novi, Meljine Hospital (Stygobium hercegnoviensis n. sp., Plagigeyeria feheri n. sp); B. Montenegro: Herceg Novi, Trebesinj (S. hercegnoviensis n. sp.); C. Montenegro: Herecg Novi, Sušćepan, Izvor Vostanj (S. hercegnoviensis n. sp.); D. Montenegro: Kotor Bay with Risan, arrow. Velika Špilja (Plagigeyeria pageti forma minor, Schütt, 1961); E. Montenegro, Herceg Novi, Nemila (S. hercegnoviensis n. sp., Paladilhiopsis matejkoi n. sp.); F. Montenegro: Izvor Vitoja (Bosnidilhia vitojaensis n. sp.). (photo’s: Jozef Grego and Maroš Grego).

Figures 31–39. Discussed species of the genus Plagigeyeria: 31–34 Plagigeyeria pageti forma minor Schütt, 1961 from cave Velika Špilja, Risan (Paratype SMF 221256); 35–38 Plagigeyeria feheri n. sp. (Holotype HNHM 103046); 39 Plagigeyeria feheri n. sp. (Paratype 1 coll. Glöer).