Geostiba (Tropogastrosipalia) svanetica, Assing, 2017

Assing, Volker, 2017, A revision of Geostiba of the West Palaearctic region. XXV. New species from Georgia and Greece, and additional records (Coleoptera: Staphylinidae: Aleocharinae), Linzer biologische Beiträge 49 (2), pp. 1093-1106 : 1099

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Geostiba (Tropogastrosipalia) svanetica


Geostiba (Tropogastrosipalia) svanetica   nov.sp. ( Figs 7-10 View Figs 7-15 , 17 View Figs 16-18 , Map 1 View Map 1 )

T y p e m a t e r i a l: Holotype 3: "N 42°54'40 E 43°03'00 (17), Georgien Svaneti Ushguli- Zagaro Pass 2400 m, Brachat & Meybohm 28.6.2017 / Holotypus 3 Geostiba svanetica   sp. n. det. V. Assing 2017 " (cAss).  

E t y m o l o g y: The specific epithet is an adjective derived from the name of the region where the type locality is situated.

D e s c r i p t i o n: Body length 2.4 mm; length of forebody 0.95 mm. Coloration: head blackish-brown; pronotum reddish-brown; elytra brownish-yellow; abdomen blackish, with tergite II and the apex (segments VIII-X, posterior margin of tergite VII) paler; legs yellow; antennae reddish, with the basal two antennomeres pale-reddish. Microsculpture on head and pronotum very shallow, absent on elytra ( Fig. 7 View Figs 7-15 ). Posterior margin of abdominal tergite VII without palisade fringe.

3: pronotum ( Fig. 7 View Figs 7-15 ) not distinctly modified, weakly transverse, nearly 1.1 times as broad as long and 1.2 times as broad as head, posterior margin broadly and smoothly convex; elytra ( Fig. 7 View Figs 7-15 ) with short sutural carinae (extending along anterior half of suture) immediately behind scutellum and with fine non-granulose punctation, disc very shallowly impressed; abdominal tergites III and IV ( Fig. 8 View Figs 7-15 ) each with a median tubercle; tergite VII ( Figs 9-10 View Figs 7-15 ) with a short, narrow (antero-dorsal view), and erect median spine at posterior margin; median lobe of aedeagus ( Fig. 17 View Figs 16-18 ) 0.22 mm long and with straight and very slender cristal process.

♀: unknown.

C o m p a r a t i v e n o t e s: This species is easily distinguished from G. tiflisensis   , the only other Tropogastrosipalia   species previously recorded from the Greater Caucasus, by much less pronounced microsculpture on the head and the pronotum, a darker head (reddish in G. tiflisensis   ), and the male sexual characters: the practically unmodified, transverse male pronotum, male elytra with sutural carinae (absent in G. tiflisensis   ), non-granulose punctation (granulose in G. tiflisensis   ), and very shallowly impressed disc (distinctly impressed in G. tiflisensis   ), modified male tergites III and IV (unmodified in G. tiflisensis   ), and a much narrower cristal process of the aedeagus. For characters distinguishing G. svanetica   from G. gibberiventris   see the comparative notes in the following section. The median lobe of the aedeagus of G. tiflisensis   is illustrated in Fig. 16. View Figs 16-18

D i s t r i b u t i o n: The type locality is situated near the Zagaro Pass in the east of Svaneti region, North Georgia ( Map 1 View Map 1 ). The holotype was found under a stone in a subalpine grassland at an altitude of 2400 m (MEYBOHM pers. comm.).


Tavera, Department of Geology and Geophysics


Royal British Columbia Museum - Herbarium