Plagigeyeria vriosticaensis, 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 : 36

Plagigeyeria vriosticaensis sp. nov.

urn:lsid:zoobank.org:act:BE0E3ADC-7F3F-4866-9BCD-2769746A2A81

Fig. 12 C–D

Type material

Holotype

BOSNIA AND HERCEGOVINA • 1 shell; West Herzegovina Canton , Vitina, Vrelo “Vrioštica” ( Fig. 3E ); 43.237595° N, 17.485963° E; 98 m a.s.l.; 2 Apr. 2018; J. Grego, D. Angyal, G. Jakab and M. Olšavský leg.; HNHM-MOLL-104182.

Paratypes

BOSNIA AND HERCEGOVINA • 4 shells; same data as for holotype; SBMNH 626400 /2, coll. Grego /2 .

Dimensions

Holotype: H 2.82 mm; W 1.76 mm; BH 1.66 mm; BW 1.31 mm; AH 1.21 mm; AW 1.17 mm.

Paratype: H 3.00 mm; W 1.45 mm; BH 1.72 mm; BW 1.28 mm; AH 1.24 mm; AW 1.28 mm.

Etymology

Named after the type locality: spring of Vrioštica River.

Description

Elongate oval shell with 4.5 convex whorls and deep suture, 2.8 mm high, with blunt rounded apex, milky-white colour with rusty incrustations. Shell surface shiny and finely axially ribbed at the teleoconch. Nepionic whorl faintly spirally ribbed. Umbilicus narrow, slit-like. Aperture rhomboid-oval with outward reflex, posteriorly and anteriorly more expanded. Peristome blunt, and reflexed along the aperture outline. Outer lip lateral profile straight and sinuous posteriorly. Sinuation present at columellar marginal profile. Aperture protruded against teleoconch outline from frontal view.

Differentiating features

The species is closely related to P. angyaldorkae sp. nov., from which it differs by having a smaller number of whorls and a more prominent body whorl and, by a more narrow umbilicus and different shape of aperture. Conchologically, it represents an intermediate shell morphology between P. angyaldorkae sp. nov. and P. jakabi sp. nov., from which it can be distinguished by its more robust shell shape and different shape of the aperture with much broader posterior channel and by a smaller umbilicus. From sympatric P. ozimeci sp. nov. it differs by a larger shell with more whorls, a less conical shell shape and by a different shape of the aperture. Shell morphometry comparison with the related species is presented in the Table 3.

Habitat

See the habitat of P. ozimeci sp. nov.

Distribution

The species is 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.