Geostiba (Sibiota) dentata, Assing, 2019

Assing, Volker, 2019, A revision of Geostiba of the West Palaearctic region. XXVII. New species from Georgia and Kyrgyzstan, and additional records (Coleoptera, Staphylinidae, Aleocharinae), Linzer biologische Beiträge 51 (2), pp. 717-730 : 728-729

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.

Figures

Figs 34-42: Geostiba prominens (34-37) and G. dentata (38-42): (34, 38) male forebody in dorsal view; (35) male forebody in lateral view; (36-37, 41-42) median lobe of aedeagus in lateral and in ventral view; (39) head in lateral view; (40) male abdominal segments VI-VII. Scale bars: 34-35, 38-40: 0.5 mm; 36-37, 41-42: 0.1 mm.