Corynoneura cylindricauda, 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 : 8

Corynoneura cylindricauda sp. n.

( Figs 4 A–E)

Type material: Holotype male (BDN No. 25092), P. R. CHINA: Xinjiang Province, Aletai City, Eerqisi river, 88°07'E, 47°55'N, alt. 400 m, sweep net, 3.xii.2002, Hongqu Tang.

Etymology. From Latin, cylinder and cauda, tail, appendage, referring to the cylindrical anal point.

Diagnostic characters. The species is similar to C. tokarapequea in having antenna with 11 flagellomeres and a similarly shaped sternapodeme, but can be separated by having a cylindrical anal point and broad inferior volsella.

Description

Male (n = 1).

Total length 1.32 mm. Wing length 0.84 mm. Total length / wing length 1.6. Wing length / length of profemur 3.2.

Coloration: Head brown. Antenna and palp yellow. Thorax dark brown. Legs yellow. Abdomen blackish brown. Wings light yellow to hyaline, with pale yellow clava.

Head: Antenna ( Fig. 4 B) with 11 flagellomeres; ultimate flagellomere 140 µm long, with rosette of apical sensilla chaetica, apically expanded, thickening 60 µm long; AR 0.42. Tentorium ( Fig. 4 E) 135 µm long, 15 µm wide. Stipes 63 µm long. Palpomeres length (in µm): 13; 15; 20; 25; 58. Palpomere 2, 3 and 4 ellipsoid, 5 long and slender. Palpomere 5/ 3: 2.9.

Thorax: Dorsocentrals 5, prealars 4. Scutellum with 2 setae.

Wing ( Fig. 4 A): VR 3.2. C length 190 µm, C/ wing length 0.23. Cu length 510 µm. Cu / wing length 0.61. Wing width / length 0.42. C with 7 setae.

Legs: Spurs of fore tibia 20 µm and 13 µm long, of mid tibia 13 µm and 8 µm long, and of hind tibia 28 µm long. Width at apex of fore tibia 23 µm, of mid tibia 28 µm, of hind tibia 35 µm. Apex of hind tibia expanded, with comb of 17 setae, one seta near spur strongly S-shaped. Lengths and proportions of legs as in Table 2.

TABLE 2. Lengths (in µm) and proportion of leg segments of Corynoneura cylindricauda sp. n., male.

fe ti ta1 ta2 ta3 ta4 ta5 LR BV SV BR p1 265 300 165 100 58 28 33 0.55 3.4 3.4 1.7 p2 375 310 210 93 45 20 33 0.68 4.7 3.3 2.7 p3 310 315 185 100 43 20 33 0.59 4.2 3.4 2.0 Hypopygium ( Figs 4 C–D): Tergite IX with posterior margin almost straight, with many short setae. Anal point present, cylindrical, 10 µm long, 10 µm wide. Superior volsella well developed, inferior volsella large, rounded posteriorly, partly united with superior volsella. Sternapodeme inverted U-shaped; coxapodeme 33 µm long, attachment point with phallapodeme placed in caudal position of sternapodeme and caudally directed; phallapodeme curved, not extending beyond posterior margin of tergite IX, 38 µm long. Gonocoxite 88 µm long. Gonostylus apically bent, 20 µm long; megaseta 5 µm long. HR 4.4, HV 6.6.

Figures

FIGURE 4. Corynoneura cylindricauda sp. n., male. A. Wing. B. Antenna. C. Hypopygium, dorsal view. D. Hypopygium, ventral view. E. Tentorium.