Corynoneura latusatra, 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 : 21-23

Corynoneura latusatra sp. n.

( Figs 12 A–E)

Type material: Holotype male (BDN No. 22248), P. R. CHINA: Guizhou Province, Daozhen County, Dashahe, 29°00'– 29°13'N, 107°22'– 107°48'E, alt. 1.300–1.900 m, sweep net, 25.v.2004, Hongqu Tang. Paratypes: 8 males, Guizhou Province, Daozhen County, Dashahe, 29°00'– 29°13'N, 107°21'– 107°47'E, alt. 1.300–1.900 m, sweep net, 25.v.2004, Hongqu Tang.

Etymology. From Latin, latus, broad, wide; and atra, black, referring to the antenna being expanded and black distally

Diagnostic characters. Similar to C. secunda in having sternapodeme inverted strongly V-shaped, and phallapodeme well developed and strongly curved, but the two species can easily be separated as C. latusatra has 7 flagellomeres and an AR of 0.31.

Description.

Male (n = 9).

Total length 0.78–0.91, 0.85 mm. Wing length 0.55–0.60, 0.51 mm. Total length / wing length 1.2–1.59, 1.42. Wing length / length of profemur 3.14–3.43, 3.30.

Coloration: Head yellowish brown with brown frontal vertex. Antenna pale yellow with black apex, palpomere pale yellow. Thorax pale brown to hyaline with vittae, scutum, scutellum and postnotum brown, anterior anepisternum II, preepisternum, epimeron II light brown. Tergites I–IV yellow, tergites V–IX brown. Legs yellow. Wing yellowish to hyaline.

Head: Antenna ( Fig. 12 B) with 7 flagellomeres; ultimate flagellomere 53–60, 57 µm long, antenna with rosette of apical sensilla chaetica, apically expanded, thickening 50–56, 53 µm long, with maximum width 18–25, 20 µm; AR 0.28–0.33, 0.31 (7). Clypeus with 8–12, 9 (6) setae. Tentorium ( Fig. 12 E) 93–105, 97 µm long. Stipes 40–50, 45 µm long. Palpomeres length (in µm):10–15, 12; 10–15, 13; 13–18, 14; 13–20, 15; 28– 38, 35. Palpomere 2, 3 and 4 ellipsoid, palpomere 5 rectangular, Palpomere 5/ 3: 1.7–3.0, 2.5.

Thorax: Dorsocentrals 3–5, 4 (5), prealars 2–5, 3. Scutellum with 1–2, 1 setae.

Wing ( Fig. 10 A): VR 2.9–3.6, 3.2. C length 120–150, 140 µm, C / wing length 0.22–0.25, 0.24. Cu length 295–330, 321 µm. Cu / wing length 0.54–0.58, 0.56. Wing width / wing length 0.4–0.43, 0.42. C with 3 setae. Legs: Spurs of fore tibia 13–20, 16 µm and 9–15, 11 (5) µm long, spurs of mid tibia 6–10, 8 (7) µm and 5–8, 6 (3) µm long, and of hind tibia 25–30, 27 µm and 23 (2) µm long. Width at apex of fore tibia 13–20, 15 µm, of mid tibia 10–18, 13 µm, of hind tibia 28–33, 30 µm. Apex of hind tibia expanded, with comb of 14–17, 15 setae and one hook-like seta near spur. Lengths and proportions of legs as in Table 5.

Hypopygium ( Figs 10 C–D): Tergite IX large, covering almost the whole gonocoxite, with weakly bilobed posterior margin, and many short setae. Laterosternite IX with 1 long seta. Superior volsella narrow. Inferior volsella absent. Sternapodeme inverted strongly V-shaped, apically acute, 63–68, 65 (6) µm long; coxapodeme 13–20, 15 (6) µm long; attachment point with phallapodeme placed in caudal third of lateral sternapodeme and directed caudally; phallapodeme well developed, strongly curved with projection for joint with sternapodeme placed pre-lateral, not extending beyond tergite IX, 85–90, 86 µm long, 8–13, 10 (6) µm wide. Gonocoxite 45–55, 50 µm long, with 2 setae apically. Gonostylus strongly curved, 18–25, 20 µm long; megaseta 5–8, 6 µm long. HR 2–2.9, 2.3, HV 3.4–4.4, 3.9 (6).

TABLE 5. Lengths (in µm) and proportion of leg segments of Corynoneura latusatra sp. n., male.

fe ti ta1 ta2 ta3 ta4

p1 165–185, 176 213–235, 226 95–105, 101 45–58, 51 20–35, 22 18–23, 20 p2 223–245, 234 203–233, 218 108–120, 115 50–58, 54 25–30, 28 15–20, 18 p3 175–200, 192 155–225, 208 88–103, 98 48–58, 54 20–25, 23 13–18, 14 ta5 LR BV SV BR

p 1 25–30, 28 0.43–0.47, 0.45 3.6–4.5, 3.9 3.8–4.2, 3.9 1.3–1.8, 1.5 p 2 25–28, 26 0.52–0.55, 0.53 4.4–4.7, 4.5 3.8–4.1, 4.0 1.2–1.5, 1.3 p 3 23–30, 26 0.43–0.58, 0.48 3.7–4.6, 4.1 3.7–4.3, 4.0 0.9–1.2, 1.0

Figures

FIGURE 10. Corynoneura kisogawa Sasa et Kondo, 1993, male. A. Wing. B. Hypopygium, dorsal view. C. Hypopygium, ventral view.

FIGURES 12. Corynoneura latusatra sp. n., male. A. Wing. B. Antenna. C. Hypopygium, dorsal view. D. Hypopygium, ventral view. E. Tentorium.