Bicellaria setitibia, 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 : 246-247

Bicellaria setitibia sp. nov.

( Figs 12, 17 )

Type material. HOLOTYPE ♂, Georgia, [in Cyrillic] East Georgia, Lagodekhi zapovednik (Natural Reserve), 26–28.vii.1969, V. Kovalev (ZMMU). PARATYPES: 2♀, same data; 1♂, 1♀, same locality, 27.vii.1969 (CULSP: 1♂, 1♀, ZMMU: 2♀). Russia: Republic of North Ossetia-Alania: 1♂, Kakadur, Vladikavkaz env., 27.vii.1925, Kiritschenko (NHMH).

Diagnosis. Halter blackish brown in both sexes; third antennal segment without elongate dorsal setae; both fore and mid tibiae with longer setae also on distal part; hind basitarsus narrow and hind tibia slightly swollen in both sexes. Male hypandrial processes narrow, with rather long apical seta; only right phallic hook present, long and sharply bent, left one reduced; female tergites 5–8 and sternites 6–7 partly shining, sternite 8 polished.

Etymology. The species is named after the long setose tibiae.

Description. Male. Head brownish-black, dark brownish grey microtrichose, black setose. Holoptic, facets in dorsal half much larger than in ventral half, about 15–17 facets in line of contiguity of eyes. One pair of rather long ocellar setae and additional pair of shorter setae on hind part of ocellar triangle. Occiput dark brownish black. Face slightly narrowed ventrally, dorsal part about 0.07 mm and ventral part about 0.05 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 0.15 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) = 14–16: 4– 8: 18–21. Thorax brownish-black, dark brownish grey microtrichose, prescutellar area with very small lighter patch in front of scutellum. All thoracic setae black. Chaetotaxy: 7–9 broadly biserial long acrostichals (up to 0.15 mm in front of suture); 9–12 uniserial dorsocentrals as long as or slightly longer than acrostichals; about 16–19 setae in intrahumeral and posthumeral areas; 3–5 subequally long postpronotals; notopleuron with 4–5 unequally long setae arranged in irregular row; 1 supraalar- and 3 prealar; 1 long postalar; 2 pairs of scutellars. Legs including coxae blackish brown to brownish black, microtrichose and black setose, parts of trochanters and hind femur posteriorly shining. Fore femur with anteroventral setae one-third as long as depth of femur and posteroventral setae slightly shorter than depth of femur. Fore tibia with posteroventrals as long as (in apical third) or slightly longer than depth of tibia, ventral pilosity very short, row of anterodorsals 0.10–0.15 mm long (3–4 are slightly stronger than others), developed also on hind part of tibia and similar row of slightly longer (about 0.20 mm) posterodorsals. Mid femur with sparse row of anteroventrals scarcely half as long as depth of femur (in middle part) but longer both proximally and distally, with posteroventrals slightly longer than depth of femur. Mid tibia with 4–5 pairs of setae dorsally (about 0.20 mm long) present also on apical third of tibia, other (short) setae including ventral ones slightly longer than depth of tibia. Hind femur with 15–17 anterodorsal setae slightly longer than depth of femur (longer proximally), with row of 16–18 subequally long anteroventrals, posteroventrals 2/3 as long as depth of femur. Hind tibia slightly swollen in apical part (0.11 mm at broadest point in comparison with 0.07 mm in basal third), longest anterodorsals and posterodorsals up to 0.15 mm long, ventral setae slightly longer than depth of tibia in middle part, longer proximally and much shorter distally. Basitarsus of all legs thin and short setose. Wing light brownish infuscated; stigma brown, long (0.60–0.70 mm), almost parallel-sided and narrower (0.06–0.07 mm) than cell r1 (0.09–0.10 mm at broadest point). Distance between tips of veins R1 and R2+3 about 0.35–0.40 mm. Squama dark brown with dark fringes, halter blackish brown. Abdomen blackish-brown, darker (brownish-black) in dorsal view and lighter (blackish-brown) in lateral view, microtrichose, entirely black setose, posteromarginals on sides of tergites much longer than segment (longest lateral as well as ventral setae up to 0.35 mm long). Genitalia ( Figs 12, 17 ) similar to B. spuria and B. ingrata : hypandrial processes narrow, with rather long apical seta; postgonites elongate trapezoid in shape, only right phallic hook present, long and sharply bent, left one reduced. Female. Thoracic setae shorter and less numerous than in male (about 10 in intra- and posthumeral areas), abdominal setae shorter. Tergite 5 polished on basal half, tergites 6–8 shining except dorsoapical corner, lateral parts of sternites 6–7 partly polished, sternite 8 polished, otherwise abdomen microtrichose. Length: body 2.7–3.1 mm, wing 2.4–3.2 mm.

Remarks. Bicellaria setitibia sp. nov. belongs to the B. spuria complex of species (characterised by at most 3 setae on apical part of palpus, hind basitarsus slender, fore tibia on apical third without long ventral pilosity and with posteroventrals at least as long as depth of tibia, third antennal segment without long dorsal seta, body entirely black setose and male hypandrial processes long and narrow and only a single phallic hook present). The genitalia are very similar to B. spuria (compare Barták & Kubík (2013, figs 33, 34) with Figs 12 and 17 ). However, both species may be differentiated according to characters given in the key. The small number of specimens did not enable us to decide if the long right hook of the phallus is ’typical’ or only an exception (all studied specimens of B. spuria and B. ingrata had left phallic hook long and right one reduced).

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.