Thienemanniella absens, 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 : 4-8

Thienemanniella absens sp. n.

( Figs 4 A–C)

Type material. Holotype male (BDN No. 26776), CHINA: Zhejiang Province, Taishun County, Wuyanling (27°30΄N, 119° 46΄E), 1611 m a.s.l., light trap, 1.viii.2005, Bingchun Ji. Paratypes: CHINA: Shannxi Province, Zhouzhi County (34°11΄N, 108° 13΄E), 2896 m a.s.l., light trap, 1 male (BDN No. 04450), 7.viii.1994, Xinhua Wang.

Diagnostic characters. The species resembles T. flaviscutella (Tokunaga) in having an antenna with 12 flagellomeres and AR 0.25–0.28, but may be separated by having hairy eyes, triangular superior volsella and absence of inferior volsella; the phallapodeme curved with a basal projection to join prelateral sternapodeme, lateral sternapodeme directed caudoventrad.

Etymology. From Latin, absens , absent, referring to the absence of inferior volsella.

Description. Male imago (n =2).

Total length 1.45–2.20 mm. Wing length 0.66–0.97 mm. Total length / wing length 2.2–2.3. Wing length / length of profemur: 2.6–2.7.

Coloration. Head brown. Thorax dark brown. Abdominal segments brown. Legs yellowish brown. Wings hyaline with yellow clava.

Head. Eyes hairy, reniform. Antenna with 12 flagellomeres; ultimate flagellomere 80–110, 95 µm long; antenna distally with apical sensilla chaetica, subapically expanded, thickening 75 µm long with maximum width 30 µm; AR 0.25–0.28. Temporals: 2 inner verticals. Clypeus with 13–15 setae. Tentorium 113–140 µm long. Stipes 68–98 µm long. Palpomeres length (in µm): 15, 25; 30–40; 35; 50–60; 125–135; palpomeres 2 and 3 ellipsoid, palpomere 4 rectangular, palpomere 5 long and slender; palpomere 5/3: 3.4–4.2.

Thorax. Dorsocentrals 8–13, 11 in single row; prealars 2. Scutellum with 2 setae.

Wing ( Fig. 4 A). VR 1.8–1.9. C length 240–350 µm, C/ wing length 0.36. Cu length 340–450 µm. Cu/ wing length 0.46–0.51. Wing width/ wing length : 0.41–0.45. C with 11–19 setae.

Legs. Fore trochanter with small keel. Spurs of fore tibia 28–33 µm and 13 µm long, spurs of mid tibia 15–23 µm and 13 µm long, of hind tibia 20–33 µm and 18–25 µm long. Width at apex of fore tibia 20–30 µm, of mid tibia 20–28 µm, of hind tibia 28–35 µm. Hind tibial comb composed of 11–13 setae. Lengths and proportions of legs as in Table 1 .

Hypopygium ( Fig. 4 B–C). Tergite IX with straight posterior margin, with many short setae, laterosternite IX without long setae. Superior volsella triangular, inferior volsella absent. Transverse sternapodeme 30–33 µm long, with developed oral projection; coxapodeme 40 µm long; phallapodeme curved, with basal projection, 50–55 µm long. Gonocoxite 83–110 µm long with 6 setae apically, and many strong setae on the inner side. Gonostylus straight, simple, 38–58 µm long; megaseta 5 µm long. HR 1.9–2.2, HV 3.9. Female and immature stages. Unknown.

Distribution. China (Zhejiang and Shannxi Provinces)

Figures

FIGURES 4. Thienemanniella absens sp. n., male. A. Wing; B. Hypopygium, dorsal view; C. Hypopygium, ventral view.

Tables

TABLE 1. Lengths (in µm) and proportion of leg segments of T. absens sp. n.

fe	ti	ta1	ta2	ta3 ta4
p1 250–360	275–365	190–250	75–105	30–60 13–23
p2 320–490	280–415	200–295	115–135	50–75 15–20
p3 275–395	285–415	195–270	115–160,	48–73 13–20
ta5	LR	BV	SV	BR
p1 20–35	0.64–0.68	4.4–5.2	2.8–2.9	1.7–2.3
p2 28–38	0.7–0.71	4.1–4.5	3.0–3.1	2.3–2.7
p3 30–38	0.65–0.68	3.7	2.9–3.0	2.8–3.0