Plagigeyeria ljutaensis, 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 : 13

Plagigeyeria ljutaensis sp. nov.

urn:lsid:zoobank.org:act:A8D69E19-07EA-4432-9C5A-7FE2DA89BBC4

Figs 5D , 6A

Type material

Holotype

BOSNIA AND HERCEGOVINA • 1 shell; Bosnian Federation , Herzegovina-Neretva Canton , Konjic Municipality, Ljuta River spring ( Fig. 2A ); 43.644611° N, 18.029714° E; 383 m a.s.l; 29 Mar. 2018; J. Grego, D. Angyal, G. Jakab and M. Olšavský leg.; HNHM-MOLL-104180.

Paratypes

BOSNIA AND HERCEGOVINA • 37 shells; same data as for holotype; HNHM-MOLL-104181/1, SBMNH 626401 /6, coll. Grego /19, coll. Glöer /1 .

Dimensions (holotype)

H 2.09 mm; W 1.49 mm; BH 1.16 mm; BW 0.93 mm; AH 0.9 mm; AW 0.78 mm.

Etymology

Named after the type locality: Ljuta River spring (as called in material citation).

Description

The elongate-conical shell is 2.1 mm in height, with blunt elevated apex, milky-white colour and five inflated whorls separated by a deep suture. Shell surface finely axially ribbed with weak corrugated spiral ribs forming a cancellate structure. Prominent at the nepionic whorl. Wavy spiral cords continue towards the unribbed apex (18 cords) and to protoconch with strongly malleated nucleus. Umbilicus narrow slit-like. Excentric-oval aperture is attached to the body whorl. Peristome blunt and outward reflexed along the aperture outline. Outer lip lateral profile weakly sinuous, columellar lip is weakly concave. Columellar lip profile weakly concave. Expanded aperture conspicuously protruded against body whorl at frontal view.

Differentiating features

The new species differs from the geographically close P. plagiostoma species from Vrelo Bosna in Ilidža ( Fig. 5A ) by its more conical shell with more inflated whorls, blunter apex, more narrow umbilicus and larger aperture.

Habitat

The shells of the new species were found in the sediments of a large karst spring of Ljuta River (383 m a.s.l.) (right tributary of Neretva River) rising from a small cave in a narrow gorge at the southwestern edge of Bjelašnica Massif (2067 m a.s.l.). The karst conduits are likely draining waters from northern Bjelašnica and from Džepi Polje (830 m a.s.l.). They are captured by a waterworks to supply potable water for Konjic.

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.