Boreoheptagyia alulasetosa Makarchenko, Wu et Wang, 2008

Makarchenko, Eugenyi A., Endo, Kazuo, Wu, Jingyang & Wang, Xinhua, 2008, A review of Boreoheptagyia Brundin, 1966 (Chironomidae: Diamesinae) from East Asia and bordering territories, with the description of five new species, Zootaxa 1817 (1), pp. 1-17 : 2-4

Boreoheptagyia alulasetosa Makarchenko, Wu et Wang , sp. n.

( Figs 1–6 )

Type material. Holotype male, CHINA: Sichuan Province, Kangding County, Wasi Gully , 15.vi.1996, light trap, X. Wang ( BDN) . Paratypes: 8 males, CHINA: Sichuan Province, Kangding County, Zheduo River ,

8.vi.1996, X.Wang; 2 males, Yunnan Province, Dali City, Wucang Mountain, Qingbi Brook , 23.v.1996, X. Wang; 2 males, Yunnan Province, Lijiang Country, Tiger Leaping Gorge , 26.v.1996, Y. Du.

Etymology. From Latin alula, posterior lobe of wing and setosa, with setae.

Diagnostic characters. The species can be separated from other species of the genus on the inflated gonostylus, presence of many small spinules in apical part of the aedeagal lobe, and by having 13 flagellomeres and alula with 3–4 setae.

Male (n = 14–15)

Total length 2.3–3.0 mm. Wing length 1.43–2.08 mm. Total length / wing length 1.40–1.58.

Coloration. Head brown to dark brown. Antenna yellowish to brown. Thorax brown to dark brown. Wing dark grey. Abdomen and legs yellowish to dark brown; femur and tibia of all legs with rings, basal and apical parts light brown, median part white.

Head. Frontal tubercles triangular to suboval, 15–28 µm long; with 1–2 setae, 8–58 µm long. Temporal setae includes 9–20 frontals, 5–17 outer verticals, no inner verticals, 4–8 postorbitals. Clypeus with 7–16 setae. Antenna with 13 flagellomeres, antennal plume reduced, ultimate flagellomere with few small white spots ( Figs 4, 6 ); pedicel with 2–4 setae. Lengths (in µm) of flagellomeres 2–13: 18–26, 21–30, 30–50, 52–68, 52–69, 48–66, 40–63, 38–50, 33–48, 28–45, 24–35, 34–63. Number of setae on flagellomeres 2–13 as: 3–4, 4, 4–5, 4–5, 4–5, 4–5, 4, 4, 3–4, 3–4, 3–4, 1. Subapical seta of terminal flagellomere 13–28 µm long. AR 0.07– 0.11. Lengths (in µm) of palpomeres 1–5: 20–38, 42–73, 63–95, 83–125, 144–188. Head width / palp length 0.98–1.32.

Thorax. Antepronotum with 2–7 lateral setae. Acrostichals 14–38; dorsocentrals 7–24, often in 2 groups and sometimes with 1–5 setae between the groups; prealars 9–23 in 2 groups. Scutellum with 24–61 setae. Longest and shortest acrostichals 49–103 µm and 18–50 µm long.

Wing. Costal extension 50–88 µm long. Anal lobe well developed, fully fringed. Alula with 1–8 setae. Squama with 13–34 setae ( Fig. 5 ). R with 10–26 setae, R 1 with 0–3 setae, R 4+5 with 3–8 setae, R 2+3 reduced ( Fig. 3 ). RM/MCu 1.67–2.40.

Legs. Spur of foretibia 30–45 µm long; spurs of midtibia 26–38 µm and 28–44 µm long; of hind tibia 33– 50 µm and 45–75 µm long. Hind tibial comb with 11–16 setae. Mid ta 1 with 1–2 pseudospurs, 23–30 µm long; hind ta 1 with 1–2 pseudospurs, 22–30 µm long. Lengths and proportions of legs as in Table 1.

Hypopygium ( Figs 1–2 ). Tergite IX with 9–24 setae, 60–110 µm long. Laterosternite IX with 3–11 setae. Transverse sternapodeme 33–73 µm wide. Aedeagal lobe weakly sclerotized, apical part with many small spinules. Gonocoxite 155–218 µm long. Gonostylus 68–103 µm long and inflated, with wide median part and short narrow apical part, ending in short megaseta. HR 2.04–2.76.

Distribution. The species is known only from mountain areas in Sichuan and Yunnan Provinces in Oriental China.

Figures

FIGURES 1–6. Boreoheptagyia alulasetosa Makarchenko, Wu et Wang, sp. n., male. 1–2. Hypopygium, dorsal view. 3. Wing. 4. Antenna. 5. Squama and alula. 6. Antennal flagellomeres 11–13. Scale bars: Figs 1–2, 6 = 50 µm, Fig. 3 = 500 µm, Figs 4–5 = 200 µm.