Geostiba (Sibiota) prominens, 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

Geostiba (Sibiota) prominens nov.sp. ( Figs 34-37 )

T y p e m a t e r i a l: Holotype ♂: " Kyrgyzstan: Issyk-Kul , SE Kyzyl-Tuu, 2750 m (Picea schrenkiana -forest) N42°03'54'' E077'08'22'', 22.06.2011, leg. J. Frisch / Holotypus ♂ Geostiba prominens sp. n. det. V. Assing 2019" ( MNB).

E t y m o l o g y: The specific epithet (Latin, adjective: prominent, standing out) alludes to the shape of the crista apicalis of the aedeagus.

D e s c r i p t i o n: External characters ( Figs 34-35 ) as in G. frischi , distinguished only by the sexual characters:

♂: elytra ( Figs 34-35 ) near suture not elevated, with dense and somewhat granulose punctation; abdominal tergite VII with pair of very weakly indicated carinae in posteromedian portion; posterior margin of tergite VIII weakly concave in the middle; sternite VIII strongly convex posteriorly; median lobe of aedeagus ( Figs 36-37 ) 0.28 mm long; crista apicalis long and triangularly produced at base of ventral 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 prominens 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. The holotype was sifted in a Picea schrenkiana forest at an altitude of 2750 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.