Bicellaria kovalevi, Barták, Miroslav, Plant, Adrian & Kubík, Štěpán, 2013

Barták, Miroslav, Plant, Adrian & Kubík, Štěpán, 2013, Species of Bicellaria (Diptera: Hybotidae) from Asia, Zootaxa 3710 (3), pp. 233-256 : 245-246

Bicellaria kovalevi sp. nov.

( Figs 15, 16 )

Type material. HOLOTYPE ♂, Georgia, [printed in Cyrillic] West Georgia, Borzhomskiy Zapovednik, [= Borzhomskiy Nature Reserve] 8.viii.1969, V. Kovalev (ZMMU). PARATYPES: Georgia: 2♂, same data as the holotype; 1♂, ♀, same locality, 7.viii.1969, V. Kovalev–(ZMMU); 3♂, 1♀, same data (CULSP); 1♂, West Georgia, Bakuriani, 18.vii.1969, V. Kovalev; 2♀, East Georgia, Lagodekhi Zapovednik, [= Lagodekhskiy Nature Reserve] 25.vii.1969, V. Kovalev–(ZMMU); 1♀, same locality, 27.–28.vii.1969 (CULSP); 1♂, same locality, 26– 28.vii.1969; 1♂, Adzharia, Kintrishi Zapovednik, okr. [= Kintrishskiy Nature Reserve] env. Kobuleti, 13.v.1971, V. Kovalev–(ZMMU); 1♂, same data (CULSP).

Diagnosis. Halter blackish brown in both sexes; third antennal segment without elongate dorsal setae; all body setae black; hind basitarsus narrow and hind tibia slightly swollen in both sexes. Male hypandrial processes long and narrow, abruptly axe-like broadened at apex with rather long seta in the middle of broadened part; both phallic hooks present.

Etymology. The species is named in honour of the late Vladimir Kovalev, collector of the type series and well known Russian dipterologist.

Description. Male. Head brownish-black, dark brownish grey microtrichose, black setose. Holoptic, facets in dorsal half much larger than in ventral half, about 13–15 facets in line of contiguity of eyes. One pair of rather long ocellar setae. Occiput dark grey. Face slightly narrowed ventrally, dorsal part about 0.05 mm and ventral part about 0.04 mm broad at narrowest point. Clypeus slightly paler grey microtrichose. Palpus short, brown, with 2–3 setae. Labrum short, brown, polished. Antenna black, 2nd segment short setose (longest ventral setae about 0.10 mm); 3rd segment without elongate dorsal setae; ratio of broad part of segment 3: narrow part of segment 3: arista (at 0.01 mm resolution) = 10–13: 4–6: 17–19. Thorax brownish-black, dark brownish grey microtrichose, prescutellar area evenly dark or with only very small lighter patch in front of scutellum. All thoracic setae black. Chaetotaxy: 5–9 broadly biserial long acrostichals (up to 0.15 mm in front of suture); 8–9 uniserial dorsocentrals as long as or slightly longer than acrostichals; about 5–9 setae in intrahumeral and posthumeral areas; 3 almost subequally long postpronotals; notopleuron with 4–5 setae arranged in irregular row (1–2 setae often longer and stronger than others); 1 supraalar- and 2–3 prealar; 1 long postalar; 2 pairs of scutellars. Coxae blackish brown, microtrichose, black setose, fore and mid ones with rather strong upright anterior setae. Legs brown, microtrichose and black setose. Fore femur with both antero- and posteroventral setae slightly shorter than depth of femur. Fore tibia with setae about as long as depth of tibia or slightly longer including posteroventrals, 1–3 posterodorsals up to twice as long as depth of tibia, ventral pilosity not developed. Mid femur with sparse row of anteroventrals scarcely onethird as long as depth of femur (in middle part), with much longer posteroventrals as long as or slightly longer than depth of femur. Mid tibia with 2–3 antero- and posterodorsal setae in basal half (up to 0.20 mm long), other short setae slightly longer than depth of tibia. Hind femur with 14–16 anterodorsal setae slightly longer than depth of femur, with row of 14–18 anteroventrals slightly shorter than anterodorsals, posteroventrals half as long as depth of femur. Hind tibia slightly swollen in apical part (0.13 mm at broadest point in comparison with 0.07 mm in basal third), longest anterodorsals and posterodorsals up to 0.20 mm long, ventral setae slightly longer than depth of tibia in middle part, longer proximally and much shorter distally. Tarsi of both fore and mid legs thin and short setose, basitarsus of hind leg thin (0.06–0.07 mm), slightly broader than 2nd segment. Wing light brownish infuscated; stigma brown, long (0.60–0.70 mm), almost parallel-sided and subequally broad as cell r1 (about 0.08 mm at broadest point). Distance between tips of veins R1 and R2+3 about 0.20–0.25 mm. Squama dark brown with dark fringes, halter blackish brown. Abdomen blackish-brown, darker (brownish-black) in dorsal view and lighter (greyish-brown) in lateral view, microtrichose, entirely black setose, posteromarginals on sides of tergites much longer than segments (longest lateral and ventral setae up to 0.40 mm long). Genitalia ( Figs 15, 16 ) with hypandrial processes very long and axe-like broadened apically, with single long seta in middle of broadened apex; postgonites elongate-ovate in shape, median extension of postgonites slightly saw-toothed ventrally; left phallic hook long, right one slightly shorter. Female prescutellar area often lighter than rest of mesoscutum; abdominal setae shorter than in male. Tergite 8 polished at least on basal half, sternite 8 polished, otherwise abdomen microtrichose. Length: body 2.2–2.7 mm, wing 2.3–2.7 mm.

Remarks. Bicellaria kovalevi sp. nov. is very similar to B. spuria . Differential characters are given in the key. Most striking differences are in the shape of the male genitalia: hypandrial processes are apically broadened in B. kovalevi sp. nov. but narrow in B. spuria and median extension of postgonites is saw-toothed in B. kovalevi sp. nov. and smooth in B. spuria . Moreover, right phallic hook is much longer in above described species than in B. spuria . Females are difficult to differentiate. Based on materials at disposal it seems that B. kovalevi sp. nov. has smaller broad part of 3rd antennal segment and hind basitarsus distinctly slightly broader than 2nd hind tarsomere (in B. spuria broad part of 3rd antennal segment usually longer than 0.14 mm and hind basitarsus equally thick as second hind tarsomere).

Figures

FIGURES 9 – 17. 9 – 10. Hypandrium (ventral view) and phallus with postgonites (lateral view) of Bicellaria globulicauda sp. nov. 11. Epandrium (lateral view) B. globulicauda sp. nov. 12. Hypandrium (ventral view) B. setitibia sp. nov. 13 – 16. Hypandrium (ventral view) and phallus with postgonites (lateral view). 13 – 14. B. ingrata Collin. 15 – 16. B. kovalevi sp. nov. 17. Phallus with postgonites (lateral view) B. setitibia sp. nov. Scale bars = 0.10 mm.