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 jakabi sp. nov. urn:lsid:zoobank.org:act: 8FFFE2C7-2DB1-4F0E-9FAD-D8027A4DD709 Fig. 12 A–B Type material Holotype BOSNIA AND HERCEGOVINA • 1 shell; Herzegovina-Neretva Canton , Studenci-Guljevina , Vrilo “Guljevina” ( Fig. 4A ); 43.181472° N , 17.602929° E ; 77 m a.s.l. ; 2 Apr. 2018 ; J. Grego , D. Angyal , G. Jakab and M. Olšavský leg.; HNHM-MOLL-104172. 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). Paratype BOSNIA AND HERCEGOVINA • 1 shell; same data as for holotype ; coll. Grego /1 . Dimensions Holotype : H 2.52 mm ; W 1.58 mm; BH 1.45 mm ; BW 1.14 mm ; AH 1.17 mm ; AW 1.00 mm. Paratype : H 2.45 mm ; W 1.40 mm; BH 1.45 mm ; BW 1.14 mm ; AH 1.13 mm ; AW 1.07 mm . Etymology Named after my friend Gabriel Jakab, a speleologist from Plešivec, Slovakia , who supported all our Balkan field trips and helped to explore the type locality of the new species. Description Solid elongate-conical 2.5 mm-high shell with blunt rounded apex, milky-yellowish colour and 4.5 convex inflated whorls separated by a deeply cut suture. Shell surface regularly axially ribbed with faintly granulose interstices. Nepionic whorl almost smooth with faint spiral rib-like structures. Umbilicus narrow, slit-like, partly obscured by the reflexed columellar marginal fold. The larger expanding reflexed aperture is tear-shaped with a sinulus-like extension at its upper-right end. Peristome blunt and trumpetlike reflexed along aperture outline, especially at upper marginal part. Outer lip lateral profile very weakly sinuous and characteristic sinuation present at columellar lip profile. Expanded aperture stepwise and conspicuously protruded against body whorl at basal view. Differentiating features P. jakabi sp. nov. differs from all related species like P. angyaldorkae sp. nov. by a typically tear-shaped aperture with a sharply conspicuous indication of a posterior channel and an oval rounded bottom part of the aperture and, by a less sinuated labral margin and by a more prominent body whorl. Shell morphometry comparison with the related species is presented in the Table 3 . Habitat The shells of the new species were washed out from subterranean aquifers through a large karst spring “Vrilo” in Guljevina ( 77 m a.s.l.). The spring rising under the thick vertical Neogene limestone cliff with a smaller cave left from the outlet and water mill ruins downstream. It is likely draining the water from Mokro Polje ( 230 m a.s.l.). Distribution Only known from the type locality.