Bicellaria amankutanensis, 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 : 235-236

Bicellaria amankutanensis sp. nov.

( Figs 1, 2 )

Type material. HOLOTYPE ♂, Uzbekistan, Amankutan, pasture, 1300 m, 39.19 N, 66.55 E, 23.v.1989, M. Barták (CULSP). PARATYPES: 28♂, 33♀, same data as the holotype (CULSP).

Diagnosis. Halter yellow in both sexes; third antennal segment without elongate dorsal setae; mesoscutal setae black and abdominal setae mostly pale; hind basitarsus narrow and hind tibia swollen in both sexes. Male hypandrial processes moderately broad; only one (left) long phallic hook present; female tergites 5–8 and sternites 6–8 polished.

Etymology. The species is named after the type locality (Amankutan, also Aman-Kutan in Uzbekistan).

Description. Male. Head brownish-black, grey microtrichose, black setose. Holoptic, facets in dorsal half much larger than in ventral half, about 14–16 facets in line of contiguity of eyes. One pair of rather long black ocellar setae. Occiput dark grey, black setose. Face slightly narrowed ventrally, ventral part about 0.03–0.04 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 setae about 0.10 mm); 3rd segment without elongate dorsal setae; ratio of broad part of segment 3: narrow part of segment 3: stylus (at 0.01 mm resolution) = 16–19: 5–7: 16–20. 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, except on hind coxa. Chaetotaxy: 6–8 broadly biserial long acrostichals (up to 0.15 mm in front of suture); 8–11 uniserial dorsocentrals as long as or slightly longer than acrostichals; about 11– 16 setae evenly spread in intrahumeral and posthumeral areas; 1 long and 1–3 somewhat shorter postpronotals; notopleuron with 3–5 setae arranged in one irregular row (one of them often conspicuously longer and stronger than other); 1 supraalar and 1–2 prealar; 1 long postalar; 2 pairs of scutellars. Legs including coxae blackish brown, microtrichose and black setose, hind coxa and trochanter (and in some specimens also base of hind femur) with some pale setae. Fore femur with short and sparse anteroventrals one-third as long as depth of femur and with row of slightly longer posteroventrals. Fore tibia with row of posterodorsals up to 2X longer than depth of tibia, otherwise short setose, posteroventrals in apical third slightly shorter than depth of tibia, ventral pilosity absent or very short. Mid femur with sparse row of anteroventrals scarcely one-third as long as depth of femur and with much longer posteroventrals as long as depth of femur. Mid tibia with irregularly arranged setae dorsally up to 2X long as depth of tibia (0–3 in each anterodorsal and posterodorsal rows), otherwise short setose. Hind femur with 15–18 anterodorsal setae on basal third up to 2X long as depth of femur but shorter apically and with row of 16–20 anteroventrals slightly longer than depth of femur at about middle and shorter both basally and apically; posteroventrals short, scarcely 0.5X long as depth of femur. Hind tibia swollen in apical part (0.14–0.17 mm at broadest point in comparison with 0.06–0.07 mm in basal part), anterodorsals and posterodorsals up to 0.20 mm long, ventral setae short. Tarsi of all legs thin, short setose, basitarsus of hind leg very slightly swollen (0.08 mm wide). Wing slightly brownish infuscated; stigma brown, long (0.60 mm), almost parallel-sided and narrow (0.06– 0.07 mm), slightly narrower than cell r1 (about 0.08–0.09 mm broad at narrowest point). Distance between tips of veins R1 and R2+3 about 0.25 mm. Squama light brownish with dark fringes, halter clear yellow. Abdomen blackish-brown in ground colour, dark blackish brown in dorsal view and pale grey in lateral view, microtrichose, mostly pale setose, dorsally with short and partly black setae; posteromarginals on sides of tergites 2–5 much longer than corresponding segments, on last tergites subequally as long as corresponding segments. Genitalia ( Figs 1, 2 ) with hypandrial processes moderately long and broad, postgonites elongate-trapezoid, slightly asymmetrical (right one slightly longer and broader at apex); left phallic hook long, right one strongly reduced. Female. Mesoscutal setae less numerous and hind tibia slightly narrower than male. Tergites 5–8 polished, sternites 6–8 polished, sternite 5 densely microtrichose (with exception of narrowly polished lateral parts), otherwise abdomen faintly microtrichose. Length: body 2.5–3.1 mm, wing 2.5–2.9 mm.

Remarks. Bicellaria amankutanensis sp. nov. is very similar to B. chimganensis sp. nov. Differential characters are given in the Remarks following the description of the latter species. Both species are rather similar to Nearctic B. halteralis (Loew, 1862) , however, the latter species has much narrower face and very long terminal seta on the hypandrial processes.

Figures

FIGURES 1 – 8. Hypandrium (ventral view) and phallus with postgonites (lateral view). 1 – 2. Bicellaria amankutanensis sp. nov. 3 – 4. B. chimganensis sp. nov. 5 – 6. B. farkaci sp. nov. 7 – 8. B. femorata Collin. Scale bars = 0.10 mm.