Thienemanniella wuyiensis, Fu, Yue, Saether, Ole & Wang, Xinhua, 2010

Fu, Yue, Saether, Ole & Wang, Xinhua, 2010, Thienemanniella Kieffer from East Asia, with a systematic review of the genus (Diptera: Chironomidae: Orthocladiinae), Zootaxa 2431, pp. 1-42 : 29-30

Thienemanniella wuyiensis sp. n.

( Figs 20 A–C)

Type material. Holotype male (BDN No. 24590), CHINA: Jiangxi Province, Wuyi Mountain (27°28’N, 118°1’E), 1800m a.s.l., sweeping, 14.VI.2004, Chuncai Yan.

Diagnostic characters. The species differs from other East Asian members of the genus by having both superior and inferior volsella triangular, with rounded margin. The species is close to T. boltoni Hestenes et Saether (Hestenes & Saether 2000: 110) in antenna with 10 flagellomeres, and the superior volsella separated from the inferior volsella, but may be separated by having an AR 0.38 and triangular inferior volsella with rounded corner.

Etymology. The name wuyiensis refers to the type locality in the Wuyi Mountain of China.

Description. Male imago (n = 1)

Total length 1.17 mm. Wing length 0.86 mm. Total length / wing length 1.36, Wing length / length of profemur 3.2.

Coloration. Head yellow-brown. Antenna, palpomeres, abdominal segments and legs yellowish brown. Thorax dark brown to yellow. Wings yellow to hyaline with pale yellow clava.

Head. Eyes hairy, reniform. Clypeus with 8 setae. Tentorium 113 µm long. Stipes 60 µm long. Antenna with 10 flagellomeres, ultimate flagellomere 125 µm long, with subapical sensilla chaetica, antenna expanded towards apex with maximum width 10 µm, AR 0.38. Palpomeres length (in µm): 12, 13, 33, 50, 98, palpomeres 2 and 3 ellipsoid, 4 rectangular, 5 long and slender; palpomere 5/ 3: 3.0.

Thorax. Dorsocentrals 6, prealars 3. Scutellum with 2 setae.

Wing ( Fig. 20 A): VR 1.5. C length 350µm, C/ wing length 0.41. Cu length 390 µm. Cu/ wing length 0.45. Wing width/ wing length 0.42. C with 11 setae.

Legs. Spur of fore tibia 25 µm and 10 µm long, spurs of mid tibia 20 µm long, of hind tibia 25 µm and 18 µm long. Width at apex of fore tibia 20 µm, of mid tibia 20 µm, and of hind tibia 28 µm. Tip of hind tibia comb composed of 10 setae. Lengths and proportions of legs as in Table 5.

fe ti ta1 ta2 ta3 ta4 ta5 LR BV SV BR p1 270 300 195 98 53 23 40 0.65 3.6 2.9 1.8 p2 395 340 – – – – – – – – – p3 290 335 215 130 57 23 40 0.64 2.7 2.9 2.7 Hypopygium ( Figs 20 B–C). Posterior margin straight, and with many short setae, laterosternite IX with 1 long seta. Gonocoxite 95 µm long without long apical setae. Gonostylus straight, 30 µm long bearing megaseta 5 µm long. Superior volsella triangular, inferior volsella also triangular, and separated from the superior volsella. Transverse sternapodeme narrow, 28 µm long, with weak oral projections; coxapodeme 18 µm long, phallapodeme curved, 30 µm long. HR 3.2, HV 3.9.

Female and immature stages. Unknown.

Distribution. China (Jiangxi Province).

Figures

FIGURES 20. Thienemanniella wuyiensis sp. n., male. A. Wing; B. Hypopygium, dorsal view; C. Hypopygium, ventral view.