Plagigeyeria ozimeci, 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 : 31-32

Plagigeyeria ozimeci sp. nov.

urn:lsid:zoobank.org:act:D4D9C7F0-9C1D-44EF-9933-C27CB712A994

Figs 11A , 12 F–K

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-104173 .

Paratypes

BOSNIA AND HERCEGOVINA • 8 shells; same data as for holotype; HNHM-MOLL-104179/1 , SBMNH 626245/2, coll. Grego /5 • 2 shells; same locality as for holotype; 22 Apr. 2019; J. Grego, M. Olšavský, G. Jakab and M. Kováčiková leg.; coll. Grego /2 ;

Dimensions

Holotype: H 1.97 mm; W 1.45 mm; BH 1.28 mm; BW 1.03 mm; AH 1.03 mm; AW 0.83 mm.

Paratypes:

H 1.82 mm; W 1.38 mm; BH 1.17 mm; BW 1.00 mm; AH 0.98 mm; AW 0.79 mm.

H 1.90 mm; W 1.28 mm; BH 1.24 mm; BW 0.93 mm; AH 1.00 mm; AW 0.86 mm.

Etymology

Named after my friend Roman Ozimec from Zagreb, Croatia who has contributed much to the speleobiology and cave exploration of the Dinarides.

Description

Narrow conical shell 1.97 mm high, with blunt globose apex and four convex whorls and semi-deep suture. Shell yellowish corneous colour with rusty-brown inorganic incrustations. Teleoconch surface covered by fine regular axial ribbing cross-sected by irregular spiral cord-like structures forming a distinct cancellated surface. The embryonal whorl surface has 16 irregular spiral cords with malleated interstices and a number of cords gradually decreasing towards the malleate apex. The body whorl could bear 2–4 distinct sharp varices. Umbilicus open. Aperture elongate-rhomboid shaped, labrally depressed. Margins outward reflexed. Outer lip lateral profile has sinuous protrusion at depressed part. Columellar lip lateral profile straight with slight elevation at its central part. Expanded aperture stepwise protruding against the teleoconch basal periphery outline.

Differentiating features

Shells of P.ozimeci sp. nov. can be found sympatrically with P.vriosticaensis sp. nov. and can be distinguished by its smaller, more conical shell shape with lower numbers of whorls and more robust shell shape with depressed labral margin. Shells of P. ozimeci frequently have on their body whorl one or more varices with sharp, winged frame not seen in other species of Plagigeyeria . From other similar sized members of the genus, it can be differentiated by its proportionally larger and more elongated aperture with labrum elevated and depressed at its middle part. The columellar peristome has a characteristic double sinuation not seen in other species. Shell morphometry comparison with the related species is presented in the Table 2 .

Habitat

The type locality is a large karst spring (98 m a.s.l.) rising from a cave under a limestone cliff in the town of Vitina. A stone wall holding a pond directs the springwater to a small disused powerplant at the left side of spring zone. A significant amount of water is also leaking under the stone wall to a lower, shallow ornamental duckpond at the northern edge of the town park. Vrelo “Vrioštica” is likely supplied by water drained in Rakitno Polje (890 m a.s.l) and through Kočerinsko Polje (302 m a.s.l.).

Distribution

Only known from the type locality.

Figures

Fig. 11. A. Plagigeyeria ozimeci sp. nov., Vitina, Vrilo Vrioštica, paratype SBMNH 626440. B. Plagigeyeria lewarnei sp. nov., spring Tučevac in Trebinje, SBMNH 626406. Scale bars = 1 mm (SEM SBMNH Vanessa Delnavaz).

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.