Revision of the stygobiont gastropod genera Plagigeyeria Tomlin, 1930 and Travunijana Grego & Glöer, 2019 (Mollusca; Gastropoda; Moitessieriidae and Hydrobiidae) in Hercegovina and adjacent regions Author Grego, Jozef 44C83AAB-CF4E-46E8-8146-DFBADA150AB6 Horná Mičiná, SK- 97401 Banská Bystrica, Slovakia. jozef.grego@gmail.com text European Journal of Taxonomy 2020 2020-07-27 691 1 56 journal article 21415 10.5852/ejt.2020.691 918d86bb-f11d-414e-9c1e-21ec17737792 3961840 CC8487E0-169D-4B32-A2AB-F9B34DFB3F3B 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.