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 Travunijana vruljakensis Grego & Glöer, 2019 Figs 5B , 14A Travunijana vruljakensis Grego & Glöer, 2019: 88 , figs 2–6 . Diagnosis Robust elongate-conical shell ( 2.7–2.9 mm ) with prominent body whorl, fine axial growth lines, blunt apex, closed umbilicus, unprotruding aperture with straight labral profile and sinuated columellar aperture margin. Penis morphology characterised by a small typical outgrowth at the left side, near the blunt penis tip. Teleoconch surface with irregular growth lines, nepionic whorl with irregular flatnodulous malleation and protoconch surface weakly regularly pitted. Distribution The species is known only from its type locality at Vrelo “Goricki Studenac” at Gorica near Trebinje and in the nearby Vrelo “Vruljak 1”. Remarks The type species of the genus can be classified as crenobiont, however the white animal and reduced eyes could suggest an adaptation to deeper crenobiont zone at the border of stygobiont habitat. The species was not found inside the deep cave zone of the adjacent cave Vrelo “Vruljak 1”. The sexual dimorphism reported for this species (Grego & Glöer 2019) can be very likely generalised to the whole genus and could explain the shell morphology variability of other species assigned herein to the genus.