Boreoheptagyia kurobebrevis (Sasa et Okazawa)

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 : 8-9

Boreoheptagyia kurobebrevis (Sasa et Okazawa)

( Fig. 21 )

Diamesa kurobebrevis Sasa et Okazawa, 1992: 58 .

Toyamadiamesa kurobebrevis (Sasa et Okazawa) ; Sasa and Kikuchi (1995: 205).

Boreoheptagyia kurobebrevis (Sasa et Okazawa) ; Endo (2002: 12).

Diagnostic characters. Total length 3.34 mm. Wing length 1.68 mm. Coloration: ground color of scutum yellow, stripes and postnotum dark brown, scutellum brown, abdominal tergites almost uniformly yellow, hypopygium dark brown, femora yellow in basal three-quarter with brown ring apically, tibiae pale medially with brown rings in basal one-fifth and distal one-third. Antenna very short, with 5 flagellomeres ( Fig. 34 ). AR 0.64. Acrostichals 28 in 2 rows, dorsocentrals 28 in 1–3 rows, not separated in anterior and posterior groups, prealars 10. Scutellum with about 50 setae. LR 1 0.67, LR 2 0.58, LR 3 0.66. Hypopygium as in Figure 21 . Gonostylus with 2 megasetae.

Remarks. The male can be separated from all other known species of Boreoheptagyia by the extremely short antenna with 5 flagellomeres and by the high AR. The hypopygium of the holotype is squeezed and additional material is needed to study this interesting species in detail.

Distribution. The species is known only from the type locality, the Kurobe River Basin in Honshu, Japan.

Figures

FIGURE 21. Hypopygium of Boreoheptagyia kurobebrevis (Sasa et Okazawa, 1992) (holotype), dorsal view.

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.