Bicellaria thailandica, 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 : 250

Bicellaria thailandica sp. nov.

( Figs 24, 25 )

Type material. HOLOTYPE ♂, Thailand, Kamphaeng Phet, Mae Wong NP, Chong Yen, 1306 m, 16°5.212´N, 99°6.576´E, Malaise trap, 31.xii.2007 – 7.i.2008, C. Piluek leg (NMWC). PARATYPES: Thailand: 2♂, 5♀, same locality as holotype, 24–31.xii.2007; 1♀, same locality, 17–24.xii.2007 –C. Piluek; 3♀, same locality, 10– 17.xii.2007; 1♀, same locality, 28.xi.–3.xii.2007; 1♀, same locality, 12–19.xi.2007 –C. Piluek & A. Inpuang; 1♂, Chiang Mai, Doi Phahompok NP Kiewlom 2, montane forest, 2112 m, 20°3.426´N, 99°8.553´E, Malaise trap, 14– 21.ix.2007; 1♂, same locality, 28.ix.–4.x.2007 –P. Wongchai; 1♀, Chiang Mai, Doi Phahompok NP Kiewlom 1, montane forest, 2174 m, 20°3.549´N, 99°8.552´E, Malaise trap, 28.v.–7.vi.2008, P. Wongchai –(CULSP: 1♂, 1♀, NMWC: 3♂, 11♀).

Diagnosis. Halter yellowish 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 broad, median extension of postgonites saw-toothed; only one (left) long phallic hook present; female tergite 8 polished in basal two -thirds, sternite 8 polished.

Etymology. The species is named after the country of origin ( Thailand).

Description. Male. Head brownish-black, dark brownish grey microtrichose, black setose. Holoptic, facets in dorsal half much larger than in ventral half, about 10–16 facets in line of contiguity of eyes. One pair of rather short ocellar setae. Occiput dark grey. Face slightly narrowed ventrally, dorsal part about 0.05 mm and 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 ventral setae about 0.10 mm); 3rd without elongate dorsal setae; ratio of broad part of segment 3: narrow part of segment 3: arista (at 0.01 mm resolution) = 12–16: 4–5: 15–19. Thorax brownish-black, brownish grey microtrichose and slightly subshining including prescutellar area. All thoracic setae black. Chaetotaxy: 5–7 broadly biserial long acrostichals (up to 0.10 mm in front of suture); 6–8 uniserial dorsocentrals as long as or slightly longer than acrostichals; some 3–5 setae in intrahumeral and posthumeral areas; 1 long and 1–2 somewhat shorter postpronotals; notopleuron with 3–4 setae arranged in irregular row (1–2 setae often longer and stronger than others); 1 supraalar- and 1 prealar; 1 long postalar; 2 pairs of scutellars. Legs including coxae blackish brown, microtrichose and black setose, hind femur with polished area in proximal posterior and ventral half. Fore femur with short and sparse anteroventrals half as long as depth of femur, with row of slightly longer posteroventrals. Fore tibia with setae about as long as depth of tibia including posteroventrals, 1–2 posterodorsal up to 2X as long as depth of tibia, ventral pilosity very short. Mid femur with sparse row of anteroventrals scarcely one-third as long as depth of femur (in middle part), with posteroventrals as long as or slightly longer than depth of femur. Mid tibia with one anterodorsal seta in proximal third and another at about middle (up to 0.20 mm long) and 1 submedian posterodorsal, other short setae slightly longer than depth of tibia. Hind femur with 14 anterodorsal setae slightly longer than depth of femur, with row of 17 anteroventrals slightly longer than anterodorsals at about middle and shorter both basally and apically, posteroventrals short, scarcely half as long as depth of femur, slightly longer on basal part. Hind tibia slightly swollen in apical part (0.11 mm at broadest point in comparison with 0.06–0.07 mm in basal third), longest anterodorsals and posterodorsals up to 0.25 mm long, ventral setae slightly longer than depth of tibia. Tarsi of all legs thin and short setose, basitarsus of hind leg thin (0.06 mm), with rather long setae dorsally (1–2 setae up to twice as long as depth of basitarsus). Wing brownish infuscated; stigma brown, long (0.70 mm), almost parallelsided and narrow (0.06–0.07 mm), slightly narrower than cell r1 (about 0.09–0.10 mm broad at narrowest point). Distance between tips of veins R1 and R2+3 about 0.30 mm. Squama light brownish with dark fringes, halter yellowish brown. Abdomen blackish-brown, dark and almost velvety brown in dorsal view and dark brownish grey in lateral view, microtrichose, pale setose, dorsally with short and partly black setae, posteromarginals on sides of tergites 2–5 much longer than segment, on subsequent tergites subequally long as their corresponding segments. Genitalia ( Figs 24, 25 ) with hypandrial processes broad; postgonites elongate-trapezoid in shape, median extension of postgonites saw-toothed and setose ventrally; left phallic hook long, right hook strongly reduced. Female. Abdominal setae much shorter than in male. Tergites 6–8 polished in basal 1/4 to 1/2, sternite 8 polished, lateral parts of tergites 2–5 slightly subshining, otherwise abdomen microtrichose. Length: body 2.7–3.3 mm, wing 2.4–3.1 mm.

Remarks. All specimens of type series are rather damaged, devoid of most mesoscutal setae; however, their arrangement, number and length may be judged from their articulations and several setae present on some specimens. The species described above is very similar to B. spuria and differential characters are given in the key. Most striking differences are in the shape of male genitalia: the hypandrial processes are much narrower in B. spuria than in the above described species and the median extension of postgonites is saw-toothed in B. thailandica sp. nov. and smooth in B. spuria . Moreover, the ventral apodeme (not illustrated) is very narrow in dorsal view in B. thailandica sp. nov. (not broader than phallic hook), whereas it is much broader (about three times broader than phallic hook) in B. spuria . Another peculiar feature of the species is the setose median extensions of postgonites.

Figures

FIGURES 18 – 26. Hypandrium (ventral view) and phallus with postgonites (lateral view). 18 – 19. Bicellaria furcifer Melander. 20 – 21. B. koreana sp. nov. 22 – 23. B. shatalkini sp. nov. 24 – 25. B. thailandica sp. nov. 26. Tip of hind tibia and basitarsus B. woodi sp. nov. Scale bars = 0.10 mm.