A revision of Geostiba of the West Palaearctic region. XXVI. New species and additional records, primarily from the Caucasus region (Coleoptera: Staphylinidae: Aleocharinae) Author Assing, Volker text Linzer biologische Beiträge 2018 2018-12-17 50 2 1033 1054 journal article 22475 10.5281/zenodo.3776388 fb6fbaa8-c279-408d-bbf5-d1dbe71f5827 0253-116X 3776388 Geostiba ( Sibiota ) unicuneata ASSING , 2016 ( Map 2 ) M a t e r i a l e x a m i n e d: Nagorno-Karabakh: 13♂♂ , 3♀♀ , ca. 50 km WNW Stepanakert, S Dadivank, 39°59'N , 46°15'E , 1610 m , mixed deciduous forest margin, litter and roots sifted, 5.VII.2018 , leg. Assing & Schülke (cAss, MNB). Armenia : 4♂♂ , 5♀♀ , ca. 30 km W Kapan, 39°15'N , 46°04'E , 2040 m , N-slope, margin of mixed deciduous forest, litter and grass roots sifted, 11.VII.2018 , leg. Assing (cAss). C o m m e n t: Geostiba unicuneata was originally described based on material from the environs of Jermuk and subsequently recorded also from two localities to the north and northwest of Goris in Armenia ( ASSING 2016b , 2017a ). The above records reveal that this species is remarkably widespread in the Qarabag range ( Armenia , Nagorno- Karabakh) and present also in the Barkushati range in South Armenia ; they considerably expand the known distribution towards the north and south ( Map 2 ). The material from different localities is distinguished by slight differences in the shape of the spermatheca and the aedeagus, but otherwise no convincing evidence was found suggesting that these populations should represent distinct species.