Plagigeyeria konjicensis, 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 : 14

Plagigeyeria konjicensis sp. nov.

urn:lsid:zoobank.org:act:12169801-D468-422F-A065-0263523FB0B5

Figs 5E , 6B

Type material

Holotype

BOSNIA AND HERCEGOVINA • 1 shell; Bosnian Federation , Herzegovina-Neretva Canton , Konjic Municipality , spring at left bank of Ljuta River 300 m west of Ljuta River spring ( Fig. 2C ); 43.644130° N, 18.020711° E; 345 m a.s.l.; 29 Mar. 2018; J. Grego, D. Angyal, G. Jakab, M. Olšavský leg.; HNHM- MOLL-104174.

Paratypes

BOSNIA AND HERCEGOVINA • 21 shells; same data as for holotype; HNHM-MOLL-104175/1, SBMNH 626249 /2, coll. Grego /17, coll. Glöer /1 .

Dimensions (holotype)

H 2.09 mm; W 1.28 mm; BH 1.10 mm; BW 0.87 mm; AH 0.84 mm; AW 0.72 mm.

Etymology

Name derived from Konjic, the closest city to the type locality.

Description

Slender elongated, 2.1 mm-high shell slightly tapering towards the body whorl; milky-white colour with five convex whorls separated by a deep suture. Shell surface finely and densely axially ribbed. Very faint spiral cords are very close set, almost invisible at the teleoconch, and more prominent at nepionic whorl with 21 close-set spiral cords. Apex blunt and flat, protoconch with very faint spiral cords smoothly fading out towards the smooth, very weakly malleated nucleus. Umbilicus open. Almost round-shaped aperture weakly touching the body whorl in upper columellar part. Peristome blunt, margins reflexed along the aperture outline. Outer lip lateral profile strongly forward protruded and weakly sinuous as well as very weak sinuation present at the almost flat columellar lip profile. Expanded round aperture conspicuously protruding against the body whorl at basal view.

Differentiating features

The shells of P. konjicensis sp. nov. differ from P. plagiostoma ( Fig 5A ) and from P. ljutaensis sp. nov. by having a significantly more elongated sub-cylindrical shell with a more blunt apex, a slightly sinuated columellar margin, a less prominent body whorl, by different protoconch structure and by a more rounded aperture.

Habitat

The empty shells were found in a smaller karst spring rising at the left bank of Ljuta River (345 m a.s.l.) among larger stone debris under the road to Ljuta village; the small rivulet from the spring joining the Ljuta River after 60 m, near the ruins of a water mill. It is likely draining the southernmost tip of Bjelašnica massif, south of the village Vrdolje (between Spiljani, Dubočani, Blace and Vrdolje).

Distribution

Only known from the type locality.

Figures

Fig. 5 (next page). A. Plagigeyeria plagiostoma (A. J. Wagner, 1914), from Vrelo Bosne in Ilidža, (topotype JG F1116). B. Travunijana vruljakensis Grego & Glöer, 2019, Gorica near Trebinje, spring Studenac (holotype HNHM-MOLL-104416). C. P. inflata (A. J. Wagner, 1928), from Vrelo Bosne in Ilidža (topotype JG F1117). D. P. ljutaensis sp. nov., Konjic district, spring of River Ljuta (holotype HNHM-MOLL-104180). E. P. konjicensis sp. nov., small spring at left bank of Ljuta River, 600 m downstream of the main spring (holotype HNHM-MOLL-104174); F–G. P. olsavskyi sp. nov., Studenci, spring Kajtazovina F. Holotype (HNHM-MOLL-104178). G. Paratype (JG F1192). H–I. P. olsavskyi sp. nov., Ljubuški district, Donji Proložac, spring Mali Prokop (JG F1209).

Fig. 6. A. Plagigeyeria ljutaensissp. nov., Konjic,Vrelo Ljuta, paratype (SBMNH 626401).B. P.konjicensis sp. nov., Konjic, left side spring of Ljuta River, paratype (SBMNH 626249). C. P. plagiostoma (A. J. Wagner, 1914), Sarajevo, Ilidža, Vrelo Bosne, (SBMNH 632718). D. P. inflata (A. J. Wagner, 1928), Sarajevo, Ilidža, Vrelo Bosne (SBMNH 33032). Scale bars = 1 mm (SEM SBMNH Vanessa Delnavaz).

Fig. 2. Photos of studied localities in Hercegovina. A. Konjic. Ljuta spring (LT of Plagigeyeria ljutaensis sp. nov.). B. Blagaj, spring Buna (P. mostarensis var.). C. Konjic, spring at left bank of Ljuta Rivulet (LT of P. konjicensis sp. nov.). D. Donja Jablanica, Komadinovo Vrelo (LT of P. erossi sp. nov.). E. Vučija, Sušicka Jama (P. cf. lewarnei sp. nov.). F. Trebinje, Gorica, spring Vruljak 1 (P. robusta and P. lewarnei sp. nov.). Photos: Jozef Grego, Dorottya Angyal and Mário Olšavský.