Corynoneura korema, 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 : 19-21

Corynoneura korema sp. n.

( Figs 11 A–G)

Type material: Holotype male (BDN no. 1180), P. R. CHINA: Hainan Province, Bawangling County, 19°5'N, 109°8'E, alt. 350–1438 m, sweep net, 10.v.1988, Xinhua Wang.

Etymology. From Latin, korema , broom, referring to hind ta1 having a row of stout brush-like setae.

Diagnostic characters. Similar to C. prima in having antenna with 7 flagellomeres and AR about 0.5; but can be separated by the thorax with longitudinal vittae, VR 5.0, hind ta1 with row of stout setae, and sternapodeme inverted V-shaped.

Description

Male (n = 1).

Total length 0.74 mm. Wing length 0.46 mm. Total length / wing length 1.6. Wing length / length of profemur 3.0.

Coloration: Head dark brown. Antenna and palpomere yellow. Thorax and legs yellowish brown. Tergites yellow to brown. Wing hyaline, with pale yellow clava.

Head: Antenna ( Fig. 11 B) with 7 flagellomeres; ultimate flagellomere 83 µm long, apex with short sensilla chaetica subapically, apically slightly expanded, thickening 43 µm long, AR 0.5. Tentorium ( Fig. 11 E) 98 µm long, 8 µm wide. Stipes 35 µm long. Palpomeres length (in µm): 8; 10; 13; 15; 35. Palpomere 2, 3 and 4 ellipsoid, 5 long and slender, palpomere 5/ 3: 2.8.

Thorax ( Fig. 11 F): With two longitudinal vittae.

Wing ( Fig. 11 A): VR 5.0. C length 100 µm, C / wing length 0.22. Cu length 325 µm. Cu / wing length 0.7. Wing width / wing length 0.46. C with 5 setae.

Legs: Spur of fore tibia 20 µm long, of mid tibia 13 µm long, and of hind tibia 23 µm long. Width at apex of fore tibia 13 µm, of mid tibia 13 µm, of hind tibia 23 µm. Apex of hind tibia expanded, with comb of 15 setae and one seta near spur strongly S-shaped, hind ta1 ( Fig. 9 G) with row of stout setae. Lengths and proportions of legs as in Table 4.

Hypopygium ( Figs 11 C–D): Posterior margin straight, and with many microtriches, laterosternite IX without long seta. Anal point absent. Superior volsella not in good show. like small triangular. Inferior volsella developed. Sternapodeme inverted V-shaped, coxapodeme 25 µm long, small attachment point with phallapodeme placed in caudal third of lateral sternapodeme and directed caudally; phallapodeme strongly curved and broad with lateral apex bifid and embracing knob on lateral sternapodeme, 50 µm long, base bifurcate. Gonocoxite 63 µm long with 2 setae apically. Gonostylus small and strongly curved, 13 µm long; megaseta 3 µm long. HR 5.0, HV 5.9.

TABLE 4. Lengths (in µm) and proportion of leg segments of Corynonrura korema sp. n., male.

fe ti ta1 ta2 ta3 ta4 ta5 LR BV SV BR p1 153 170 88 53 28 13 20 0.52 3.6 3.7 – p2 205 185 95 45 25 15 23 0.51 3.6 4.1 1.3 p3 163 180 88 40 15 13 20 0.49 4.9 3.9 2.0

Figures

FIGURE 9. Corynoneura kibunespinosa Sasa, 1989, male. A. Wing. B. Hypopygium, dorsal view. C. Hypopygium,

FIGURE 11. Corynoneura korema sp. n., male. A. Wing. B. Antenna. C. Hypopygium, dorsal view. D. Hypopygium, ventral view. E. Tentorium. F. Thorax. G. Hind tarsomeres 1 – 5.