Boreoheptagyia nepalensis Makarchenko et Endo, 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 : 9

Boreoheptagyia nepalensis Makarchenko et Endo , sp. n.

( Figs 22–25 )

Type material. Holotype male, NEPAL: Langtang Region , pond near Khyimjung Glacier, 4.175 m a.s.l., 4.viii.1999, K. Endo ( LEOU).

Etymology. The name refers to the type country.

Diagnostic characters. The male is well separated from other species of the genus by the short antenna with 8 flagellomeres, presence of some setae on alula, absence of megaseta on the gonostylus, and by the shape of the gonostylus and the sternapodeme.

Male (n = 1)

Total length 2.9 mm. Wing length 2.49 mm. Total length / wing length 1.17.

Coloration. Brown with grayish abdomen. Legs brown, without light spots or rings.

Head. Temporal setae includes 43 frontals and 16 outer verticals, no inner verticals. Clypeus with 20 setae. Antenna with 8 flagellomeres, antennal plume reduced ( Fig. 22 ), ultimate flagellomere with a few small white spots, pedicel with 5 setae. Lengths (in µm) of flagellomeres 2–8: 29, 32, 34, 34, 32, 34, 122. Number of setae on flagellomeres 2–8 as: 6, 5, 6, 4, 4, 3, 5. Subapical seta of terminal flagellomere 23 µm long. AR 0.15. Lengths (in µm) of palpomeres 1–5: 27, 61, 103, 108, 186. Head width / palp length 0.92.

Thorax. Antepronotum with 9 lateral setae. Acrostichals 40; dorsocentrals 14 in 2 groups, anterior group with 8 setae, posterior group with 6 setae; prealars 21, in 2 groups, anterior group with 6 setae in single row, posterior group with 15 setae in 3 rows; supraalar 1 ( Fig. 23 ). Scutellum with 86 setae. Longest and shortest acrostichals 57 µm and 23 µm long.

Wing 0.87 mm wide. Costal extension 64 µm long. Anal lobe well developed, fully fringed. Alula with 2– 4 setae ( Fig. 24 ). Squama with 45 setae. R with 20 setae, R 1 with 6 setae, R 4+5 with 6 setae, R 2+3 clearly visible only in basal half. RM/MCu 2.29.

Legs. Spur of foretibia 38 µm long; spurs of midtibia 38 µm and 42 µm long; of hind tibia 46 µm and 61 µm long. Hind tibial comb with 11 setae. Mid ta 1 with 8 pseudospurs, ta 2 with 2 pseudospurs, 19 µm long; hind ta 1 with 10 pseudospurs, ta 2 with 2 pseudospurs, 15 µm and 23 µm long. Lengths and proportions of legs as in Table 4.

Hypopygium ( Fig. 25 ). Tergite IX with 16 setae, 89 µm long. Laterosternite IX with 10 setae. Transverse sternapodeme 34 µm wide. Aedeagal lobe weakly sclerotized, apical part smooth. Gonocoxite 201 µm long. Gonostylus 84 µm long, narrow, slightly curved, without megaseta. HR 2.41.

Distribution. The species is known only from the type locality in the high mountains of the Khyimjung Glacier Region in Nepal.

Figures

FIGURES 22–25. Boreoheptagyia nepalensis Makarchenko et Endo, sp. n., male. 22. Antenna. 23. Scutum, dorsal view. 24. Wing. 25. Hypopygium, dorsal view. Scale bars: Figs 22, 25 = 50 µm, Fig. 23 = 200 µm, Fig. 24 = 500 µm