Corynoneura prominens, 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 : 28-30

Corynoneura prominens sp. n.

( Figs 16 A –E)

Type material: Holotype male (BDN No. 24734), P. R. CHINA: Jiangxi Province, Wuyi Mountain, 27 ° 28 'N, 118 ° 1 'E, alt. 400 m, sweep net, 15.vi. 2004, Chuncai Yan. Paratypes: 2 males, as holotype (BDN No.24583, 24735); 1 male (BDN No. 05363), Chongqi City, Nanchuan County, peak of Jinfo Mountain, 29 ° 9 'N, 107 ° 8 'E, alt. 1.200 m, sweep net, 9.v. 1986, Xinhua Wang; 1 male (BDN No. 25152), Hunan Province, Hengyang County, Heng Mountain, 112 ° 52 'E, 27 ° 15 'N, alt. 1.290m, sweep net, 20.vii. 2004, Chuncai Yan.

Etymology. From Latin, prominens , projecting, standing out, referring to the broad and protruding inferior volsella.

Diagnostic characters. Similar to C. prima in having antenna with 8 flagellomeres, but can be separated by having an anal point.

Description

Male (n = 5).

Total length 0.82–0.95, 0.91 (4) mm. Wing length 0.50–0.64, 0.57 (4) mm. Total length / wing length 1.5– 1.55, 1.53 (3). Wing length / length of profemur 2.7 –3.0, 3.0 (3).

Coloration: Head yellow brown with brown frontal vertex. Antenna and palpomere pale yellowish brown. Thorax yellowish brown, abdomen brown. Legs yellow. Wings light yellow to hyaline.

Head: Antenna with 8 flagellomeres; ultimate flagellomere 83–133, 108 (4) µm long, antenna apically expanded, with rosette of apical sensilla chaetica, thickening 55 –60, 57 µm long, with maximum width 15 – 20, 18 µm; AR 0.42–0.60, 0.52 (4). Clypeus with 4 –6, 5 (3) setae. Tentorium ( Fig. 16 E) 92–115, 105 µm long, 10 –15, 13 µm wide. Stipes 35 –40, 38 (3) µm long. Palpomeres length (in µm): 10; 10 –13, 11; 13 –18, 15; 18 – 20, 19; 33 –43, 39 (4); Palpomere 2, 3 and 4 ellipsoid, palpomere 5 long and slender. Palpomere 5 / 3: 2.1–2.8, 2.6 (4).

Thorax: Dorsocentrals 5.

Wing ( Fig. 16 A): VR 3.2–3.4, 3.3 (3). C length 100–140 µm, C / wing length 0.20–0.23, 0.22 (4). Cu length 310–375, 337 (3) µm. Cu / wing length 0.53–0.59, 0.57. Wing width / wing length 0.44–0.48, 0.46. C with 5 –7, 6 setae.

Leg: Spurs of fore tibia 10 –18, 13 (4) µm and 8 –10, 8 (2) µm long; of mid tibia 8 –10, 8 (2) µm long; and of hind tibia 25 –35, 29 µm long. Width at apex of fore tibia 13 –18, 15 µm; of mid tibia 13 –20, 15 µm; of hind tibia 23 –33, 28 µm. Apex of hind tibia expanded, with comb of 14 –16, 15 setae and one seta near spur strongly S-shaped. Lengths and proportions of legs as in Table 9.

fe ti ta 1 ta 2 ta 3 ta 4 p 1 175–218, 197 210–240, 227 105–125, 114 55 –75, 68 28 –43, 35 13 –25, 19 p 2 235–290, 260 210–260, 229 110–165, 135 58 –73, 64 30 –38, 33 15 –23, 24 p 3 198–245, 215 200–275, 230 100–130, 110 60 –70, 64 25 –33, 28 15 –20, 18

ta 5 LR BV SV BR

p 1 20 –30, 26 0.48–0.52, 0.5 3.3–4.6, 3.8 3.6–3.9, 3.7 1.5–2.3, 1.8 p 2 25 –28, 26 0.51–0.63, 0 69 4.2–4.9, 4.5 3.3–3.7, 3.5 1.7 –2.0, 1.85 p 3 20 –30, 25 0.48–0.51, 0.49 3.8–4.2, 4.0 3.8 –4.0, 3.9 1.6–1.8, 1.7

Hypopygium ( Figs 16 C –D): Tergite IX posterior margin slightly bilobed, laterosternite IX with 1 long seta. Anal point present. Superior volsella conspicuously projecting; inferior volsella broad and protruding, with glandular setae. Sternapodeme inverted U-shaped; coxapodeme 18 µm long, attachment point with phallapodeme placed in caudal position of sternapodeme and caudally directed; phallapodeme weakly curved, not extending beyond tergite IX, 30 –35, 33 µm long, with projection basally. Gonocoxite 50 –65, 58 µm long with 1 seta apically. Gonostylus strongly curved, 18 –25, 22 (4) µm long; megaseta 3 –5, 4 µm long. HR 2.0– 3.4, 2.7 (4), HV 3.8–4.2, 4.0.

Remarks. Anal point very small and paler, several of the paratypes hard to examined.

Figures

FIGURE 16. Corynoneura prominens sp. n., male. A. Wing. B. Antenna. C. Hypopygium, dorsal view. D. Hypopygium, ventral view. E. Tentorium.