Bicellaria setipalpus, 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 : 266-267

Bicellaria setipalpus sp. nov.

( Figs 29–30 )

Type material. HOLOTYPE 3: Italy, Passo Rolle, 46°13'N, 11°42'E, 1700 m, 8.viii.1988, larch wood, M. Barták (CULSP). PARATYPES: France: 1Ƥ, Pic Long, along brook, 42°49'N, 0°09'E, 1800 m, 9.vii.1990; 1Ƥ, same locality, alpine meadow, 2200 m –all M. Barták–(CULSP). Italy: 13, same data as holotype (CULSP); 13, Mte. Terminillo, 42°26'N, 13°07'E, 2000 m, 4.viii.1988, meadow nr. wood, M. Barták (CULSP); 2Ƥ, S. Stefano di Cadore, fiuma Piave, viii.1979; 1Ƥ, Camposilvano, TN, 10.ix.1974; 13, Passo Monte, Croce Carnico, 23.viii.1964 –all G. Raffone–(MSNV); 13, 1Ƥ, S. Martino, spruce wood, 46°11'N, 11°41'E, 1500 m, M. Barták (CULSP).

Diagnosis. Entirely black setose species; third antennal segment with dorsal setae; palpus with about 10 strong setae; male hypandrial processes broadened apically; three phallic hooks present (left one bifurcate and its anterior arm bent); postgonites asymmetrical.

Description. Male. Head black, dark brownish grey microtrichose, black setose (including lower occiput). Eyes meeting on frons, facets on dorsal half much larger than on ventral half, about 16–17 facets in line of contiguity of eyes. One to two pairs of ocellar setae, posterior pair shorter. Occiput in middle hind part densely setose. Face nearly parallel-sided, about 0.06 mm broad in lower half and 0.07 mm broad in dorsal part, clypeus slightly paler grey microtrichose. Gena broad and lustrous (not easily visible if head collapsed). Palpus short, brown, with about 10 setae, some rather strong and more than 0.15 mm long. Labrum brownish black, lustrous. Antenna black, second segment long setose ventrally (longest ventral setae about 0.15 mm); third segment with 1– 2 dorsal setae (as in Fig. 48 ); ratio of broad part of segment 3: narrow part of segment 3: stylus (in 0.01 mm scale) = 16–18: 7–8: 19–20. Thorax brownish black, slightly subshining, prescutellar area similarly coloured as rest of mesoscutum, scutellum slightly paler. All thoracic setae black including fringes on squama. Chaetotaxy: acrostichals broadly biserial (8–9 in each row) and long even in presutural area (about 0.15 mm in front but longer posteriorly); dorsocentrals slightly longer than corresponding acrostichals in postusutural area; about 10–12 setae in posthumeral and intrahumeral areas; 1 longer and 2–3 slightly shorter postpronotals; notopleura with 5–6 unequally long setae; 1 supraalar and 1–2 setae in prealar area (and 1–2 additional setae close to dorsocentral row); 1 long postalar; 2 pairs of scutellars. Legs including coxae black, microtrichose (only trochanters partly lustrous) and black setose. Fore femur in basal two-thirds with row of strong anteroventrals, half as long as depth of femur and complete row of posteroventrals slightly longer than depth of femur. Fore tibia with 3 posterodorsals 3X as long as depth of tibia (0.20 mm long), posteroventrals slightly longer than depth of tibia. Mid femur with sparse row of anteroventrals about as long as depth of femur in basal half but shorter apically and with posteroventrals slightly longer than depth of femur. Mid tibia with unequally long ventral setae, longest up to 2X as long as depth of tibia, with 2–3 pairs of dorsal setae up to 0.25 mm long (longest about 3X as long as diameter of tibia). Hind femur with 16–18 dorsal and 13–16 anteroventral setae 1.5X as long as depth of femur, and with complete row of fine and much shorter posteroventrals. Hind tibia slightly swollen in apical half (0.16 mm at broadest point), subequally broad as hind femur, ventral setae about as long as depth of tibia (in basal half and shorter in apical third), 3 antero- and 5 posterodorsal setae up to 0.25 mm long. Tarsi of all legs thin and short setose. Wing brownish infuscated, stigma brown and 0.10 mm wide. Squama dark blackish-brown with black fringes, halter brown. Abdomen black, dull brownish-black in dorsal view and lighter brownish grey microtrichose in lateral view, very long black setose (marginals up to 0.50 mm long). Genitalia ( Figs 29–30 ): hypandrial processes long, broadened apically and somewhat truncate; postgonites asymmetrical: right one with ventral extension arising from caudal part of median extension; three long phallic hooks present (left hook bifurcate with anterior arm sharply bent). Female. Similar to male. Abdominal tegites 6–8 lustrous on basal third, sternite 8 lustrous. Length: body 2.0–4.0 mm, wing 3.0– 3.6 mm.

Etymology. The species is named after the strongly setose palpus.

Distribution. France, Italy.

Remarks. The species described above is a member of the B. pilosa complex of species (characterized under B. alpina ) comprising three European species ( B. pilosa , B. alpina and B. setipalpus ). Bicellaria setipalpus may be distinguished from both other species of this complex by narrower face, strongly bent anterior arm of the left phallic hook and asymmetrical postgonites. If numerous setae on the palpus are overlooked, the species is superficially very similar to B. austriaca ; however, genitalia of both species are strikingly different.

Figures

FIGURES 25 – 32. Hypandrium (ventral view) and phallus with postgonites (lateral view). 25 – 26. Bicellaria nigrita Collin. 27 – 28. Bicellaria pilosa Lundbeck. 29 – 30. Bicellaria setipalpus sp. nov. 31 – 32. Bicellaria simplicipes (Zetterstedt). 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.