Bicellaria globulicauda, 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 : 240-241

Bicellaria globulicauda sp. nov.

( Figs 9, 10, 11 )

Type material. HOLOTYPE ♂, Uzbekistan, Amankutan, pasture, 1600 m, 39.17 N, 66.54 E, 23.v.1989, M. Barták (CULSP). PARATYPES: 4♂, 3♀, same data as holotype (CULSP).

Diagnosis. Thoracic setae and most abdominal setae black, base of abdomen on sides with pale setae; third antennal segment without elongate dorsal setae; 2 setae on palpus; front tibia with posteroventral setae longer than ciliation (which is very short or absent); hind basitarsus not swollen and hind tibia very slightly swollen in both sexes. Male hypandrium long with apically bifurcate processes, postgonites with ventral projections; left phallic hook long, right one slightly smaller but equally shaped. Female visible parts of tergites 5–7 and apical half of 8th tergite microtrichose, 8th sternite polished.

Etymology. The species is named after peculiarly enlarged epandrium.

Description. Male. Head black, light grey microtrichose, black setose. Holoptic, facets in dorsal half much larger than in ventral half, about 12–13 facets in line of contiguity of eyes. One pair of rather long ocellar setae. Occiput grey, sparsely setose. Face slightly narrowed ventrally, ventral part about 0.03 mm broad at narrowest point. Clypeus slightly paler grey microtrichose. Palpus short, brown, with 2 setae. Labrum short, brown, polished. Antenna black, 2nd segment short setose (longest setae about 0.07 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) = 13–14: 4–7: 18–21. Thorax brownish-black, grey microtrichose, mesoscutum brownish grey microtrichose in dorsal view, prescutellar area differently microtrichose than other parts of mesoscutum, appearing light grey. All thoracic setae black. Chaetotaxy: 6–8 rather narrowly biserial long acrostichals (about 0.13 mm long in front of suture); 6–9 uniserial dorsocentrals as long as or slightly longer than acrostichals; some 5–10 setae in intrahumeral and posthumeral areas; 2–4 postpronotals; notopleuron with 3–5 setae arranged in irregular row; 1 supraalar- and 1 prealar; 1 long postalar; 2 pairs of scutellars. Legs including coxae brownish-black, microtrichose and black setose, hind coxa in some specimens with several pale setae. Fore femur with sparse rows of anteroventrals and posteroventrals half as long as depth of femur. Fore tibia with posterodorsals as long as depth of tibia, longer setae scarcely discernable, posteroventrals as long as depth of tibia or longer in basal third but shorter in apical part, pilosity absent or very short. Mid femur with sparse row of anteroventrals more than one third as long as depth of femur (even in middle of row) and with slightly longer posteroventrals slightly shorter than depth of femur. Mid tibia with 1–4 setae dorsally in basal half up to 2X as long as depth of tibia, otherwise short setose. Hind femur with 13–17 anterodorsal setae on basal third slightly longer than depth of femur, shorter apically, with row of 13–15 subequally long anteroventrals; posteroventrals short, scarcely one-third as long as depth of femur. Hind tibia very slightly swollen in apical part (0.09–0.10 mm at broadest point in comparison with 0.06–0.07 mm in basal part), several anterodorsals and posterodorsals up to 0.20 mm long, ventral setae short. Tarsi of all legs short, thin, short setose, basitarsus of hind leg not swollen (0.05 mm). Wing slightly yellowish infuscated; stigma light brownish yellow, 0.55–0.60 mm long, slightly narrowing apically and narrow (0.04 mm in middle), distinctly narrower than cell r1 (about 0.09 mm broad at narrowest point). Distance between tips of veins R1 and R2+3 about 0.30–0.35 mm. Squama yellowish with dark fringes, halter clear yellow. Abdomen brownish-black, almost velvety brown in dorsal view and pale grey in lateral view, microtrichose, lateral parts of basal sternites and tergites apparently polished (however, difficult to observe because all male specimens have abdomen distorted). Setae on abdomen pale, dorsally and laterally also with black setae, posteromarginals on sides of tergites 2–4 slightly longer than corresponding segments, slightly shorter on subsequent tergites. Genitalia ( Figs 9, 10, 11 ): hypandrium long with apically bifurcate processes, inner arm with short setae; postgonites short, with ventral projections; left phallic hook long, right one slightly smaller but similarly shaped (appearing as single structure in lateral view). Female. Body with setae somewhat less numerous than in male. Visible parts of tergites 5–7 and apical half of 8th tergite microtrichose, 8th sternite polished. Length: body 2.8–3.6 mm, wing 2.4–3.0 mm.

Remarks. Bicellaria globulicauda sp. nov. is somewhat similar to B. amankutanensis sp. nov. and B. chimganensis sp. nov. according to combination of the following characters: palpus with 2 setae, 3rd antennal segment without dorsal seta, hind basitarsus not swollen, fore tibia with rather long posteroventrals and without elongate ventral pilosity, and abdomen at least partly pale setose, but it may be easily differentiated on account of the very peculiar form of its male genitalia, as described in the Diagnosis.

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.