Boreoheptagyia xinglongiensis 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 : 15-16

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

( Figs 11–13 )

Type material. Holotype male, CHINA: Sichuan Province, Baoxing County, Xinglong West River , 19.vi. 1996, light trap, X. Wang ( BDN) . Paratypes: 2 males, as holotype.

Etymology. Named after the type locality.

Diagnostic characters. See key.

Male (n = 3)

Total length 2.8–3.1 mm. Wing length 1.76–1.92 mm. Total length / wing length 1.52–1.73.

Coloration. Head, thorax and abdomen brown. Antenna yellowish. Femur and tibia of all legs with rings, basal and apical parts dark brown, median part white.

Head. Frontal tubercles triangular, 18–20 µm long, with 1 seta, 50–65 µm long. Temporal setae includes 13–20 frontals, 6–12 inner verticals, and 9–14 outer verticals. Clypeus with 11–16 setae. Antenna with 13 flagellomeres, flagellomere 12 and 13 not well separated; flagellomere 13 with few median white spots; pedicel with 3 or 4 setae. Lengths (in µm) of flagellomeres 2–13: 22–26, 26–32, 34–40, 40–46, 40–42, 40–42, 36–40, 38–40, 36, 30–38, 24, 60. Number of setae of flagellomeres 2–13 as: 3–4, 3–4, 3–5, 3–5, 3–4, 3–4, 3– 4, 3–4, 3–4, 3–4, 3–4, 1–2. Subapical seta of terminal flagellomere 8–28 µm long. AR 0.13–0.14. Lengths (in µm) of palpomeres 1–5: 30–32, 40–44, 92–96, 86–112, 144–184. Head width / palp length 1.01–1.14.

Thorax. Antepronotum with 3–6 lateral setae. Acrostichals 20–24, dorsocentrals 4–6 in anterior group, prealars 1–4. Scutellum with 16–30 setae. Longest and shortest acrostichals 80–114 µm and 38–49 µm long.

Wing 0.53–0.57 mm wide. Costal extension 48 µm long. Anal lobe well developed, fully fringed. Alula without setae. Squama with 14–19 setae. R with 14–17 setae, R 1 with 1–4 setae, R 4+5 with 4–7 setae, R 2+3 very short, easily visible only in basal part; RM/MCu 2.50–2.75.

Legs. Spur of foretibia 38–44 µm long; spurs of midtibia 42–44 µm and 44–48 µm long; of hind tibia 42– 46 µm and 53–60 µm long. Hind tibial comb with 13–15 setae. Mid ta 1 with 4–6 pseudospurs, hind ta 1 with 7– 8 pseudospurs. Lengths and proportions of legs as in Table 7.

Hypopygium ( Figs 11–12 ). Tergite IX with 18–27 setae, 100–120 µm long. Laterosternite IX with 0–1 seta. Transverse sternapodeme 48–52 µm long. Aedeagal lobe weakly sclerotized, distal part without teeth. Gonocoxite 200–248 µm long; basal lobe rounded to triangular, with 5–6 short setae. Gonostylus 88–110 µm long, curved, with single short megaseta. HR 2.00–2.41.

Distribution. The species is known only from the type locality in Sichuan Province in Oriental China.

Figures

FIGURES 7–13. Boreoheptagyia ambigua Makarchenko, Wu et Wang, sp. n. (7–10) and B. xinglongiensis Makarchenko, Wu et Wang, sp. n. (11–13), males. 7, 12. Hypopygium, dorsal view. 8. Distal part of aedeagal lobe. 9, 13. Legs. 10. Antennal flagellomeres 12–13. 11. Gonostylus. Scale bars: Figs 7, 10–13 = 50 µm, Fig. 8 = 20 µm.