Geostiba (Sibiota) kalavanica, Assing, 2017

Assing, Volker, 2017, On the Geostiba fauna of Armenia (Coleoptera: Staphylinidae: Aleocharinae), Linzer biologische Beiträge 49 (2), pp. 1075-1092 : 1087

publication ID

https://doi.org/ 10.5281/zenodo.5409928

persistent identifier

https://treatment.plazi.org/id/03AA87A4-FFD7-4860-FF62-0AEAFDCAFB29

treatment provided by

Marcus

scientific name

Geostiba (Sibiota) kalavanica
status

sp. nov.

Geostiba (Sibiota) kalavanica View in CoL nov.sp. ( Figs 39-49 View Figs 39-49 , Map 4 View Map 4 )

T y p e m a t e r i a l: Holotype 3: " ARMENIA [13] – WSW Dilijan, Kalavan, 40°38'40''N, 45°06'04''E, 1700 m, oak forest, 29.VI.2017, V. Assing / Holotypus 3 Geostiba kalavanica sp. n. det. V. Assing 2017 " (cAss). Paratypes: 433, 8 ♀♀: same data as holotype (cAss).

E t y m o l o g y: The specific epithet is derived from the name of the mountain where this species was discovered.

D e s c r i p t i o n: Body length 1.9-2.4 mm; length of forebody 0.85-1.00 mm. Coloration: body dark-yellowish to pale-reddish. Eyes small, with pigmentation, and composed of approximately five ommatidia. Pronotum with a shallow longitudinal impression on either side of midline. Hind wings completely reduced.

3: elytra ( Fig. 39 View Figs 39-49 ) with pronounced, narrow, anteriorly slightly broader and posteriorly sharply edged carina extending along whole suture, disc with usually extensive and more or less pronounced impression; abdominal tergite VII ( Fig. 40 View Figs 39-49 ) with a pair of moderately pronounced carinae posteriorly; posterior margins of tergite and sternite VIII broadly and weakly convex; median lobe of aedeagus ( Figs 41-44 View Figs 39-49 ) 0.24 mm long, without distinct semi-transparent spines in internal sac; ventral process weakly curved in lateral view; paramere not distinctive.

♀: elytra and abdominal tergite VII without modifications; tergite VIII ( Fig. 45 View Figs 39-49 ) shaped as in male; posterior margin of sternite VIII ( Fig. 46 View Figs 39-49 ) convex, in the middle usually very shallowly concave; spermathecal capsule ( Figs 47-49 View Figs 39-49 ) with strongly dilated distal portion and short proximal portion.

I n t r a s p e c i f i c v a r i a t i o n: As in G. tigrani , the male secondary sexual characters may be reduced to various degrees in smaller males.

C o m p a r a t i v e n o t e s: In external characters (coloration, body size, eye size, etc.), including the male secondary sexual characters, G. kalavanica is highly similar to G. pambakica . It is distinguished from this species above all by the strongly dilated distal portion of the spermatheca. Regarding the shape of the spermatheca, G. kalavanica is most similar to G. unituber , from which it differs by the different modifications of the male tergite VII, a slightly different shape of the median lobe of the aedeagus (lateral view), and a slightly shorter proximal portion of the spermatheca.

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 near Kalavan village in Kalavan mountain, to the north of the northwestern tip of Sevan lake ( Map 4 View Map 4 ). The specimens were sifted from litter and roots on a calcareous south slope with oak forest at an altitude of 1700 m. The head of one of the males from the type locality is infested with Laboulbeniales.

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Staphylinidae

Genus

Geostiba

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