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.