Boreoheptagyia unica Makarchenko, 1994

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 : 14-15

Boreoheptagyia unica Makarchenko

( Figs 37–39 )

Boreoheptagyia unica Makarchenko, 1994: 87 .

Diagnostic characters. The species was described by Makarchenko (1994) based on a single male. The male is characterized by: total length 2.75 mm; wing length 2.5 mm. Coloration: general color dark brown, legs brownish-yellow, with dark rings. Antenna with 6 flagellomeres, without plume ( Fig. 37 ), AR = 0.49. Antepronotum with 1–2 dorsal and 14 ventral setae. Acrostichals 20 in anterior half of scutum, 16–41.6 µm long; dorsocentrals 9–10 in 2 groups ( Fig. 38 ); prealars 17–18; supraalar 1. R and R 1 with 52, R 4+5 with 28 setae. Squama with 30 setae in 1–2 rows. Anal lobe slightly reduced. LR 1 0.63, SV 1 2.98, BV 1 3.63. Hypopy- gium as in Figure 39 . Tergite IX with narrowly triangular anal point, 13 µm long. Aedeagal lobe membraneous, with small pores in posterior part. Inferior volsella small, with setae in 1–2 rows. Sternapodeme high, trapezoid. Gonocoxite simple, elongate. Gonostylus attached to gonocoxite at two-thirds distance from apex, widest medially, surface densely covered with short spine-like setae, apically with lobe and two megasetae.

Remarks. The male of B. unica can be separated from all known species of Boreoheptagyia with femalelike antenna by the shape of the aedeagal lobe and by the gonostylus being attaches to the gonocoxite twothirds the distance from the apex, and having an apical lobe and two megasetae.

Distribution. The species is known only from a mountain area (1.450 m a.s.l.) in Nikko National Park in Honshu, Japan.

Figures

FIGURES 34–39. Boreoheptagyia tibetica Makarchenko, Wang et Willassen, 1996 (34-36) and B. unica Makarchenko, 1994 (37-39), males. 34, 37. Antenna. 35, 39. Hypopygium, dorsal view. 36. Gonostylus. 38. Scutum, dorsal view.