Plagigeyeria angyaldorkae, Grego, 2020

Grego, Jozef, 2020, Revision of the stygobiont gastropod genera Plagigeyeria Tomlin, 1930 and Travunijana Grego & Glöer, 2019 (Mollusca; Gastropoda; Moitessieriidae and Hydrobiidae) in Hercegovina and adjacent regions, European Journal of Taxonomy 691, pp. 1-56 : 33-36

Plagigeyeria angyaldorkae sp. nov.

urn:lsid:zoobank.org:act:6BC5A082-0F63-4116-92B3-3BD320D5D1FA

Fig. 12E

Type material

Holotype

BOSNIA AND HERCEGOVINA • West Herzegovina Canton , Tihaljina District , Lukende, Jakšenica Village, “Vrelo Jakšenica” ( Fig. 3F ); 43.322897° N, 17.373026° E; 173 m a.s.l.; 2 Apr. 2018; J. Grego, D. Angyal, G. Jakab and M. Olšavský leg.; HNHM-MOLL-104163.

Dimensions

Holotype: H 3.07 mm; W 1.86 mm; BH 1.45 mm; BW 1.31 mm; AH 1.21 mm; AW 1.21 mm.

Etymology

Named after my friend Dorottya Angyal from the Budapest Natural History Museum, who substantially helped with the samplings during our field trip.

Description

Solid, elongate-conical shell, 3.1 mm-high, with 5.5 regularly tapering narrow inflated whorls, deep suture and blunt rounded apex, milky-white colour and fine regular sinuated axial ribs. Late protoconch faintly irregularly spirally ribbed. Umbilicus open, obscured by the outward reflexed flaring columellar margin. Expanding reflexed aperture with irregular elongate-oval shape and a slightly depressed and inward-bent labral margin. The upper labral margin is elongate-flaring. Labral lateral profile protruded and bent backward at the body whorl, columellar margin profile sinuated. Expanded upper tip of aperture is conspicuously protruded, flaring against the frontal shell profile.

Differentiating features

P. angyaldorkae sp. nov. differs from all other known species of the region by its elongate-conical shell shape with 6 whorls, by more convex whorls and proportionally smaller body whorls and by a characteristically elongated labrally depressed aperture with a slightly depressed labral margin. From Lanzaia ephantota (Megerle von Mühlfeld, 1824) it differs by larger more elongate shell wit finer, more close-set ribbs and more depressed aperture. Shell morphometry comparison with the related species is presented in the Table 3.

Habitat

The empty shell of this subterranean species was washed out by a middle-sized karst spring (173 m a.s.l.) rising from a 1.5 m-broad limestone crack among houses in the village. The strong stream flows under the main road, depositing the sand at a pond just before the old watermill ruins. The spring is likely getting its water from sinkholes north of village Drinovci (245 m a.s.l.) in Imotsko Polje.

Distribution

Only known from the type locality

Figures

Fig. 12. A–B. Plagigeyeria jakabi sp. nov., Studenci, spring Guljevina A. Holotype (HNHM- MOLL-104172). B. Paratype (JG F1204). C–D. P. vriosticaensis sp. nov., Vitina, Vrelo Vrioštica C. Holotype (HNHM-MOLL-104182). D. Paratype (JG F1214). E. P. angyaldorkae sp. nov., Vrelo Jakšenica (holotype HNHM-MOLL- 104163). F. P. ozimeci sp. nov., Vitina, Vrelo Vrioštica, holotype (HNHM-MOLL-104173). G–K. P. ozimeci sp. nov., Vitina, Vrelo Vrioštica, paratypes (JG F1215).

Fig. 3. Photos of studied localities in Hercegovina. A. Dabarsko Polje, Sušicka Peć cave near spring Vrijeka (LT of Plagigeyeria reischuetzorum sp. nov. and Travunijana gloeri sp. nov.). B. Tihaljina, spring Tihaljina in Peć Mlini Cave (Belgrandia torifera Schütt, 1961). C. Hodbina, spring Bunica (likely LT of P. mostarensis Kuščer, 1933, P. ovalis Kuščer, 1933). D. Studenci, spring Kajtazovina (LT of P. olsavskyi sp. nov.) E. Vitina, spring Vrioštica (LT of P. vriosticaensis sp. nov. and P. ozimeci sp. nov.) F. Lukende, Jakšenica, Vrelo Jakšenica (LT of P. angyaldorkae sp. nov.) Photos: Jozef Grego, Dorottya Angyal and Mário Olšavský.