Geostiba (Sibiota) polisitica, Assing, 2010

Assing, V., 2010, A revision of Geostiba of the Western Palaearctic region. XX. Four new species from Turkey and Albania, and additional, Linzer biologische Beiträge 42 (2), pp. 1125-1138 : 1135-1137

Geostiba (Sibiota) polisitica nov.sp. ( Figs 22-33 )

T y p e m a t e r i a l: Holotype: " Albania [4c], Librazhd, 25 km ESE Elbasan, Mali i Polisit , 1700 m, 41°04'07''N, 20°22'23''E, 23.V.2010, V. Assing / Holotypus Geostiba polisitica sp. n. det. V. Assing 2010" (cAss). Paratypes: 3, 3: same data as holotype (cAss); 3, 3: " Albania [4], Librazhd, 25 km ESE Elbasan, Mali i Polisit , 1700 m, 41°04'07''N, 20°22'23''E, 23.V.2010, V. Assing" (cAss) .

D e s c r i p t i o n: Body length 2.3-2.9 mm. Habitus as in Fig. 22 . Coloration: whole body yellowish red.

Head distinctly oblong, approximately 1.2 times as long as wide ( Fig. 23 ); punctation extremely fine, barely noticeable; interstices with very shallow microsculpture and glossy. Eyes reduced to minute rudiments, without ommatidia and pigmentation ( Fig. 24 ). Antenna distinctly and gradually incrassate apically, antennomere X almost twice as wide as long.

Pronotum approximately as wide as long or indistinctly transverse, 1.20-1.25 times as wide as head ( Fig. 23 ), without sexual dimorphism; punctation extremely fine, barely noticeable; interstices with distinct microreticulation and subdued shine, clearly less glossy than head; on either side of the slightly and narrowly elevated smooth midline with shallow longitudinal impressions.

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Elytra with pronounced sexual dimorphism, 0.5-0.6 times as long as pronotum ( Fig. 23 ). Hind wings absent.

Abdomen wider than elytra; punctation very fine and sparse, barely noticeable; interstices with shallow microreticulation; tergite VII with sexual dimorphism; posterior margin of tergite VII without palisade fringe.

(with secondary sexual characters fully developed): elytra with extensive and relatively deep impressions and with pronounced sharp sutural carina extending over full

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length of suture, this carina more elevated and broader anteriorly than posteriorly, punctation finely granulose, microsculpture shallow; abdominal tergite VII posteriorly with pair of posteriorly converging carinae (i.e., shaped like a V) ( Fig. 25 ); posterior margin of tergite VIII truncate ( Fig. 26 ); posterior margin of sternite VIII weakly and obtusely pointed in the middle ( Fig. 27 ); median lobe of aedeagus as in Figs 28-29 ; apical lobe of paramere very slender.

: elytra without impressions and carinae, punctation very fine, non-granulose, and barely noticeable, microreticulation distinct; tergite VIII with weakly convex posterior margin ( Fig. 30 ); posterior margin of sternite VIII convex, in the middle indistinctly concave ( Fig. 31 ); spermateca shaped as in Figs 32-33.

I n t r a s p e c i f i c v a r i a t i o n: In one of the males, the pair of carinae on the abdominal tergite VIII is missing and the elytral punctation is not distinctly granulose.

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

C o m p a r a t i v e n o t e s: InthekeyinASSING (2009), the species would key out at couplet 26 together with G. samai PACE from Macedonia and G. sculpticollis (APFELBECK) from northern Albania. In order to account for the new species, the key is modified as follows:

26: median lobe of aedeagus smaller and with more pronounced lateral folds ( ASSING 2001b: Figs 13-14 ).: spermatheca as in ASSING (2001b: Figs 16-17 ). N-Macedonia: Šar planina .................................................................................................... G. samai PACE

-: median lobe of aedeagus larger and with less pronounced lateral folds.: spermatheca of different shape. Species from Albania...................................................26a

26a: median lobe of aedeagus in lateral view with longer and more strongly curved ventral process ( ASSING 2000a: Figs 21-22 ).: distal portion of spermatheca distinctly dilated ( ASSING 2000a: Fig. 24 ). N-Albania: Mirditë.............. G. sculpticollis (APFELBECK)

-: median lobe of aedeagus in lateral view with shorter and very weakly curved ventral process ( Figs 28-29 ).: distal portion of spermatheca weakly dilated ( Figs 32- 33 ). Central Albania: Librazhd: Mali i Polisit....................................... G. polisitica nov.sp.

D i s t r i b u t i o n a n d b i o n o m i c s: Thetypelocality is situated in the Mali i Polisit range to the southeast of Elbasan, Librazhd province (central Albania). The specimens were sifted from debris and roots at the bottom of a dolina below a large snowfield and from leaf litter near snow in an old calcareous beech forest at an altitude of 1700 m.

Figures

Figs 22-33: Geostiba polisitica nov.sp. (22-24: holotype): (22) male habitus; (23) male forebody; (24) head in lateral view; (25) male abdominal segments VI-VII in dorsal view; (26) male tergite VIII; (27) male sternite VIII; (28-29) median lobe of aedeagus in lateral and in ventral view; (30) female tergite VIII; (31) female sternite VIII; (32) spermatheca; (33) distal portion of spermathecal capsule. Scale bars: 22: 1.0 mm; 23-25: 0.5 mm; 26-27, 30-31: 0.2 mm; 28-29, 32-33: 0.1 mm.

Figs 7-14: Geostiba kazica nov.sp. (7-8, 10-11: holotype): (7) male habitus; (8-9) male forebody; (10) head in lateral view; (11) male abdominal segments VI-X in lateral view; (12-13) median lobe of aedeagus in lateral view; (14) spermatheca. Scale bars: 7: 1.0 mm; 8-11: 0.5 mm; 12-14: 0.1 mm.

Figs 15-21: Geostiba extensicollis nov.sp. (15-19: holotype): (15) male habitus; (16) male forebody; (17) head in lateral view; (18) male abdominal segments VI-VIII in lateral view; (19-20) median lobe of aedeagus in lateral view; (21) spermatheca. Scale bars: 15: 1.0 mm; 16-18: 0.5 mm; 19-21: 0.1 mm.