Corynoneura nankaiensis, Fu, Yue, Saether, Ole A. & Wang, Xinhua, 2009

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 : 27-28

Corynoneura nankaiensis sp. n.

( Figs 15 A–E)

Type material: Holotype male (BDN No. 05361), CHINA: Tianjin City, Nankai University, 39°8'N, 117°1'E, alt. 2–5m, sweep net, 20.iv.1986, Xinhua Wang. Paratypes: 3 males as holotype (BDN slides no. 0 5356, 0 5351, 05357).

Etymology. Named after the type locality.

Diagnostic characters. Similar to C. scutellata in having antenna with 10 flagellomeres, inferior volsella digitiform, and sternapodeme inverted V-shaped, but can be separated by tergite IX with a posterior hyaline structure and anal point.

Description

Male (n =4).

Total length 1.32–1.82, 1.63 mm. Wing length 0.95–1.05, 1.02 mm. Total length / wing length 1.3–1.9, 1.6. Wing length / length of profemur 2.6–3.3, 3.0.

Coloration: Head blackish brown. Antenna and palpomere pale yellowish brown. Thorax and abdomen brown. Legs yellowish brown. Wings yellowish to hyaline.

Head: Antenna with 10 flagellomeres; ultimate flagellomere 235–310, 268 µm long, apex with short sensilla chaetica subapically, apically acute. AR 0.72–0.94, 0.84. Clypeus with 6–10, 8 (3) setae. Tentorium ( Fig. 15 E) 103–148, 129 (3) µm long, 13–20, 17 (3) µm wide. Stipes 65–75, 70 (3) µm long. Palpomeres length (in µm): 13–18, 15; 20–23, 21; 23–28, 26; 18–35, 30; 68 (2). Palpomere 2 and 3 ellipsoid, 4 rectangular, 5 long and slender. Palpomere 5 / 3: 2.45–3.0, 2.7.

Thorax: Dorsocentrals 6–7.

Wing ( Fig. 15 A): VR 2.6–3.0, 2.8. C length 300–400 µm, C / wing length 0.29–0.4, 0.33(3). Cu length 600–710, 697 µm. Cu / wing length 0.57–0.71, 0.64. Wing width / wing length 0.32–0.34, 0.33 (2). C with 7 setae.

Legs: Spurs of fore tibia 25–35, 31 µm and 15–18, 16 µm long, of mid tibia 13–20, 15 (3) µm long, and of hind tibia 28–35, 31 µm long. Width at apex of fore tibia 25–30, 27 µm, of mid tibia 23–28, 25 µm, of hind tibia 45–50, 48 µm. Apex of hind tibia expanded, with comb of 12–18, 14 setae and one seta near spur strongly S-shaped. Lengths and proportions of legs as in Table 8.

Hypopygium ( Figs 15 C–D): Tergite IX with posterior margin slightly bilobed, with a hyaline structure, each lobe with about 4 setae, anal point present. Laterosternite IX with 2 setae. Inferior volsella digitiform, with glandular setae; sternapodeme inverted V-shaped; coxapodeme 45–55, 50 µm long, attachment point with phallapodeme placed in caudal third of lateral sternapodeme and directed caudally; phallapodeme strongly curved with projection for joint with sternapodeme placed pre-lateral, almost extending beyond tergite IX, 80–85, 83 µm long, with projection basally. Gonocoxite 88–100, 91 µm long with 2 setae apically. Gonostylus strongly curved, 18–25, 22 (4) µm long, with protuberance basally; megaseta 8–11 µm long. HR 2.9–4.0, 3.3, HV 4.4–4.6, 4.5 (2).

Figures

FIGURE 15. Corynoneura nankaiensis sp. n., male. A. Wing. B. Antenna. C. Hypopygium, dorsal view. D. Hypopygium, ventral view. E. Tentorium.