Thienemanniella curvare, Fu, Yue, Fang, Xiangliang & Wang, Xinhua, 2013

Fu, Yue, Fang, Xiangliang & Wang, Xinhua, 2013, Two Species of Thienemanniella Kieffer from Oriental China (Diptera: Chironomidae: Orthocladiinae), Zootaxa 3741 (3), pp. 391-399 : 392-394

Thienemanniella curvare sp. n.

( Figs 1 B–G )

Material examined. Holotype male, CHINA: Guangdong Province, Guangzhou City, Conghua County, Wenquan Town , 16.i.2011, sweeping net, H.Q.Tang ( HBMY Type no.0005) . Paratypes: 1 male, CHINA: Guangdong Province, Guangzhou City, Yangchun County, Shiwang Town , 26.xii.2010, sweeping net, H.Q.Tang ( HBMY Type no.0004) ; 1 male, Guangzhou Province, Conghua County, Sanyatang Town , 16.i.2011, sweeping net, H.Q.Tang ( HBMY Type no.0003) .

Derivatio nominis. From Latin curva , meaning curve, referring to upcurved superior volsella.

Diagnostic characters. The male imago is separated from all the other members of the genus by the antenna with 10 flagellomeres, AR 0.65–0.72, 0.69; apex of superior volsella digitiform and upcurved, antero-medially separate, inferior volsella broad, placed caudally on gonocoxite. Phallapodeme slightly curved, joint with sternapodeme placed laterally.

Male (n=3). Total length 1.50–1.60, 1.55 mm. Wing length 0.93–1.08, 1.01 mm. Total length/wing length 1.44–1.48. Wing length/profemur length 2.86–3.05. Wing width/wing length 0.36–0.38.

Coloration. Head brown; antenna, legs and abdomen yellowish brown. Thorax dark brown.

Head. Eyes hairy. Antenna ( Fig. 1C ) with 10 flagellomeres, flagellum apically club–shaped, with apical sensilla chaetica, ultimate flagellomere 216–240, 232 µm long. AR 0.65–0.72, 0.69. Tentorium, stipes and cibarial pump as in Fig. 1D , tentorium 103–120, 112 µm long, 10–15, 12 µm wide; stipes 84–88, 86 µm long, 5 µm wide. Lengths of palpomeres (in µm): 16–18, 17; 16–18, 17; 28–30, 29; 50–53, 51; 110–115, 113. Palpomere 5/3 ratio: 3.8–3.9. Clypeus with 18–22, 20 setae.

Thorax. Antepronotals absent. Dorsocentrals 10 uniserial. Scutellum with 2 setae.

Wing ( Fig. 1B ). VR 1.73–1.81, 1.78. Cu/wing length 0.49–0.53, 0.52; C 370–385, 380 µm long; Cu 495–530, 525 µm long. Brachiolum with 1 seta; wing width/wing length: 0.38; Costa with 16 setae.

Legs. Spurs of fore tibia19–24, 22 and 12 µm long; of mid tibia 10–12, 11 and 14–17, 16 µm long; of hind tibia 31–36, 32 and 20–24, 22 µm long. Width at apex of fore tibia 22–24, 23 µm; of mid tibia 22–26, 24 µm; of hind tibia (a) 34–38, 36 µm. Width of hind tibia 1 / 3 from apex (d) 20–24, 22 µm; elongation length (b) 19–21, 20 µm; length of maximum thickening (c 1) 47–49, 48 µm; total length of thickening (c 2) 75–82, 80 µm; a/d 1.6–2.0, 1.8; b/ d 0.86–0.90, 0.88; c 1 /d 2.1–2.3, 2.2; c 2 /d 3.5–3.9, 3.6. Hind tibia slightly expanded, with comb of 12–13 setae, one seta near spur strongly curved ( Fig. 1E ). Lengths and proportions of legs as in Table 1.

Hypopygium ( Fig. 1F–G ). Tergite IX and laterosternites IX without long setae. Superior volsella anteriomedially separate, upcurved apically. Inferior volsella placed caudally in gonocoxite, with many short setae on the margin. Phallapodeme curved medially, 31–43, 37 µm long. Transverse sternapodeme 28–32, 30 µm. Megaseta stout, 5–7, 6 µm long. Gonocoxite 74–84, 81µm long with 1 long seta apically, inner margin of gonocoxite with thin glandular setae. Gonostylus 29–36, 33 µm long. HR 2.33–2.58, 2.47; HV 4.1–4.3, 4.2.

Distribution. Subtropical regions of Oriental China.

Figures

FIGURE 1. A. Measurements of hind tibia in Thienemanniella. B–H. Thienemanniella curvare sp. n. Male imago. B. Wing. C. Antenna. D. Tentorium, stipes and cibarial pump. E. Hind tibial apex. F. Hypopygium, dorsal view. G. Hypopygium, ventral view.