Geostiba (Sibiota) dentata nov.sp. (Figs 38-42)

T y p e m a t e r i a l: Holotype ♂: " Kyrgyzstan: Issyk-Kul, Kyzyl-Tuu - Kyzyl-Suu: S Barskoon: Barskaun Pass, N-slope, 3230 m, N41°54'15'' E077'38'36'', 24.06.2011, leg. J. Frisch / Holotypus ♂ Geostiba dentata sp. n. det. V. Assing 2019" (MNB).

E t y m o l o g y: The specific epithet (Latin, adjective: dentate) alludes to the toothshaped process of the crista apicalis of the aedeagus.

D e s c r i p t i o n: External characters (Figs 38-39) as in G. frischi and G. prominens, distinguished only by the sexual characters:

♂: elytra (Fig. 38) distinctly elevated at suture, this elevation with coarse granules; abdominal tergite VII (Fig. 40) with a pair of long, narrow, and weakly elevated carinae in postero-median portion; posterior margin of tergite VIII convex, in the middle indistinctly concave; sternite VIII strongly convex posteriorly; median lobe of aedeagus (Figs 41-42) 0.29 mm long; crista apicalis long, sinuate, and near base of ventral process with a pronounced tooth-shaped process (lateral view); internal sac without spines; paramere of similar shape as that of G. frischi .

♀: unknown.

C o m p a r a t i v e n o t e s: Geostiba dentata is distinguished from other Sibiota species recorded from Kyrgyzstan particularly by the shape of the crista apicalis in lateral view.

D i s t r i b u t i o n a n d n a t u r a l h i s t o r y: The type locality is situated in East Kyrgyzstan, to the south of Issyk-Kul lake, at an altitude of 3230 m.