Bicellaria andorra, Barták, Miroslav & Kubík, Štěpán, 2013

Barták, Miroslav & Kubík, Štěpán, 2013, Species of Bicellaria Macquart (Diptera: Hybotidae) of Europe, with descriptions of four new species, Zootaxa 3647 (2), pp. 251-278 : 254-255

Bicellaria andorra sp. nov.

( Figs 5–6 )

Type material. HOLOTYPE 3: Andorra , Pyrenees, Pto. de Envalira, 42°33'N, 1°42'E, 1800 m, pine wood nr. brook, M. Barták (CULSP). PARATYPES: Andorra , 73, 1Ƥ, same data as holotype (CULSP); 73, 1Ƥ, Pyrenees, Pto. de Envalira, 42°32'N, 1°43'E, 2200 m, subalpine meadow, M. Barták (CULSP). France, 283, 10Ƥ, Pyrenees, Pic Long, 42°49'N, 0°09'E, 9.vii.1990, 2200 m, alpine meadow, M. Barták (CULSP).

Diagnosis. Third antennal segment without dorsal setae; fore tibia with sparse and short posteroventral setae; abdomen almost entirely pale setose; hind femur without posteroventral setae. Male hypandrial processes with several long setae near apex, postgonites long and narrow, only left phallic hook long, simply curved, right one reduced.

Description. Male. Head black, dark grey microtrichose, black setose (including lower occiput). Eyes meeting on frons, about 14–17 facets in line of contiguity of eyes; facets on dorsal half much larger than on ventral half. Two pairs of long black ocellar setae, posterior pair shorter. Occiput rather densely setose. Face slightly narrowing ventrally, dorsal part just below antennae about 0.05 mm broad and ventral part about 0.04 mm broad at narrowest point. Clypeus slightly paler grey microtrichose. Palpus short, brown, with 3–5 setae. Labrum brown, lustrous. Antenna black, second segment short setose (longest setae about 0.10 mm); third without dorsal setae; ratio of broad part of segment 3: narrow part of segment 3: stylus (at 0.01 mm scale) = 15–17: 5–6: 15–20. Thorax black to brownish black, microtrichose, mesoscutum almost velvety black in dorsal view, prescutellar area evenly dark, only scutellum slightly lighter. All thoracic setae black including fringes on squama. Chaetotaxy: acrostichals broadly biserial and long even in presutural area (about 0.15 mm in front but longer posteriorly); dorsocentrals nearly evenly long, about 15 setae in posthumeral and intrahumeral areas; 1 longer and several slightly shorter postpronotals; notopleura with 4–7 unequally long setae in one irregular row; 1–2 supraalars and several setae in prealar area; 1 long postalar; 2–3 pairs of scutellars (often 2 setae on one side and 3 on other side). Legs including coxae black, microtrichose and black setose (only hind coxa sometimes with several pale setae posteriorly). Fore femur with row of very short anteroventrals and row of longer posteroventrals (half as long as depth of femur). Fore tibia with longest posterodorsals 1.5X as long as depth of tibia, posteroventrals in apical third short and sparse, shorter than depth of tibia (similar as in Fig. 46 ). Mid femur with sparse row of anteroventrals, half as long as depth of femur, with much stronger and longer posteroventrals slightly longer than depth of femur. Mid tibia with ventral setae equally long (about as long as depth of tibia), with 2–3 pairs of setae dorsally up to 3X as long as depth of tibia (0.15 mm). Hind femur with 16–17 anterodorsal setae slightly longer than depth of femur (on basal part) and with 14–16 rather strong anteroventrals about as long as depth of femur, posteroventral part without setae, covered with fine pilosity. Hind tibia swollen in apical half (0.13–0.14 mm an broadest point), slightly broader than hind femur (0.12–0.13 mm at broadest point), dorsal setae longer and ventral shorter than depth of tibia. Tarsi of all legs thin and short setose. Wing slightly brownish infuscated, stigma dark brown and narrow (0.04 mm), about 3.2X as long as distance between tips of veins R1 and R2+3. Squama dark brown with black fringes, halter dark brown. Abdomen black, dull brownish black microtrichose in dorsal view and grey in lateral view, densely and long yellowish-white setose on sides and ventrally, dorsally with very short pale or black setae. Genitalia ( Figs 3– 4 ) with hypandrial processes narrow, U-shaped, with several long setae near apex; postgonites long and narrow; only left phallic hook long, simply curved and situated close to apices of postgonites, right one reduced. Female. Similar to male. Hind tibia (0.12 mm at broadest point) equally broad or slightly narrower than hind femur. Tergites 6–8 narrowly lustrous in basal part and ventrally, sternites 6–7 microtrichose (at most with narrow lustrous streak laterally), sternite 8 lustrous. Length: body 2.3–3.0 mm, wing 2.3–2.7 mm.

Etymology. The species is named after the country where the holotype was collected ( Andorra ).

Distribution. Andorra , France.

Remarks. The species described above belongs to the B. sulcata complex of species as proposed by Chvála (1991). However, it differs from both remaining European representatives of this complex [ B. sulcata (Zetterstedt) and B. vana Collin ] in yellowish-white setose abdomen. Moreover, the absence of posteroventral setae on the hind femur is a unique feature of this species.

Figures

FIGURES 1 – 8. Hypandrium (ventral view) and phallus with postgonites (lateral view). 1 – 2. Bicellaria albopilosa Chvála. 3 – 4. Bicellaria alpina Bezzi. 5 – 6. Bicellaria andorra sp. nov. 7 – 8. Bicellaria austriaca Tuomikoski. Abbreviations: eapejaculatory apodeme, hph—phallic hooks, mep—median extensions of postgonites, pgn—postgonites, vap—ventral apodeme. Scale bars = 0.10 mm.

FIGURES 41 – 48. 41 – 44. Hypandrium (ventral view) and phallus with postgonites (lateral view). 41 – 42. Bicellaria uvens Melander. 43 – 44. Bicellaria vana Collin. 45 – 46. Distal part of front tibia and proximal part of front basitarsus (posterior view). 45. Bicellaria spuria (Fallén). 46. Bicellaria vana Collin. 47 – 48. Antennae. 47. Bicellaria dispar Oldenberg. 48. Bicellaria alpina Bezzi (microchaetae mostly omitted). Scale bars = 0.10 mm.