Corynoneura sorachibecea Sasa et Suzuki

Fu, Yue, Saether, Ole A. & Wang, Xinhua, 2009, Corynoneura Winnertz from East Asia, with a systematic review of the genus (Diptera: Chironomidae: Orthocladiinae), Zootaxa 2287, pp. 1-44 : 32

Corynoneura sorachibecea Sasa et Suzuki

( Figs 18 A–C)

Corynoneura sorachibecea Sasa et Suzuki, 2001: 7 .

Material examined. JAPAN: Hokkaido, Sorachi River, Sorachi, sweep net, male holotype (No.404: 69), 5.ix.2000, H. Suzuki.

Diagnostic characters. The species can be separated from other East Asian Corynoneura by having antenna with 10 flagellomeres, apically acute, AR 0.56–0.61, sternapodeme inverted V-shaped, phallapodeme strongly curved, no inferior volsella, gonostylus with small inner lobe in subapical part.

Additional description and corrections. Abdominal tergites with few setae, 0 on T I, 2 on each of T II– IX, while in the original description Sasa & Suzuki (2001) mentions abdominal tergites with small number of setae, 0 on I, 1 on II to IV, 2 on VI and VII, 1 on VIII, and 2 on IX. The ninth tergite without an anal point like Y-shaped ridge on the ventral side. The ventral Y-shaped ridge mentioned by Sasa apparently is the phallapodeme. Some additional characters should be added: Tentorium 125 µm long, 13 µm wide. Sternapodeme inverted V-shaped; coxapodeme 30 µm long; attachment point with phallapodeme placed in caudal position of sternapodeme and ventrally directed; phallapodeme 75 µm long, strongly curved with projection for joint with sternapodeme placed pre-lateral. Gonocoxite 80 µm long with 4 long setae apically. Gonostylus 38 µm long; megaseta very short. HR 2.1, HV 3.3. The wing and hypopygium of holotype are redrawn ( Figs 18 A–C).

Distribution. Japan.

Figures

FIGURE 18. Corynoneura sorachibecea Sasa et Suzuki, 2001, male. A. Wing. B. Hypopygium, dorsal view. C. Hypopygium, ventral view.