Nanocladius (Nanocladius) taiwanensis, Fu, Yue & Wang, Xinhua, 2009

Fu, Yue & Wang, Xinhua, 2009, Four new species of Nanocladius Kieffer from Oriental China (Diptera: Chironomidae: Orthocladiinae), Zootaxa 1985, pp. 43-51 : 47-48

Nanocladius (Nanocladius) taiwanensis sp. n.

( Fig. 3 A–E)

Type material. Holotype male, CHINA: Taiwan Province: Taizhong County, 24°06'N, 120°24'E, 200–800 m a.s.l., 23.v.2000, light trap, K. Ma (BDN No.14579). Paratype: 1 male, same data as holotype (BDN No. 14580).

Diagnostic characters. The species is similar to N. (N.) minimus Saether, 1977 in AR and the shape of the phallapodeme, but can be easily separated on the distribution of setae on the abdomen and the shape of the inferior volsella.

Etymology. The name refers to Taiwan Province.

Male (n = 1–2). Total length 1.95–2.12 mm. Wing length 1.1 mm. Total length / wing length 1.9. Wing length / length of profemur 2.9.

Coloration. Head, palp, and antenna yellowish brown. Legs pale yellow, femur of mid- and hind legs yellowish brown in basal 1/2. Abdominal tergites I–III brown with pale yellow margins, tergites IV–VI darker brown with pale yellow margins, tergite VII brown.

Head. Antenna with 13 flagellomeres; ultimate flagellomere 230–240 µm long, apex slightly expanded, with long sensilla chaetica. AR 0.61–0.62. Temporal setae absent. Clypeus with 6–8 setae. Tentorium 138 µm long, 15–18 µm wide. Stipes 125 µm long. Palpomere lengths (in µm): 15–25, 25–28, 60–63, 90–95, 135–153. Palpomere 5/3 2.25–2.44.

Wing ( Fig. 3 A). VR 1.18. Cu 520 µm long. Squama and veins bare. Cu / wing length 0.47. Wing width / wing length 0.37.

Thorax. Dorsocentrals 7, prealars 1. Scutellum with 2 setae.

Legs ( Fig. 3 B). Spur of foretibia 28–35 µm long, spurs of midtibia 10–15 µm long, of hind tibia 35 µm long. Hind tibial comb with 11–12 setae. Width at apex of foretibia 28–33 Μm, of midtibia 30 Μm, of hind tibia 38–40 Μm. Lengths and proportions of legs as in Table 3.

fe ti ta1 ta2 ta3 ta4 ta5 LR BV SV BR p1 360–380 475–510 280 225 140 80 65 0.59 2.2 3.0 2.0 p2 365–400 400–425 190 110 85 60 50 0.48 3.2 4.0 2.0 p3 380–425 430–520 290 – – – – 0.56 – – – Abdomen ( Fig. 3 C). Number of setae on tergites I–VII: 2, 3, 3, 11, 9, 6, 4.

Hypopygium ( Fig. 3 D–E). Anal point 33 Μm long, with 5 setae at base. Tergite IX with 8–10 setae; laterosternite IX with 1 setae. Phallapodeme 70 Μm long; transverse sternapodeme 65 Μm long, with oral projections. Gonocoxite 138–140 Μm long, with 6–7 setae. Inferior volsella pointed triangular. Gonostylus 65–68 Μm long, with several setae along inner margin in distal 1/3. HR 2.0–2.2; HV 2.9–3.3.

Distribution. The specimens were collected in a subtropical area in Taiwan Province, Oriental China.

Figures

FIGURE 3. Nanocladius (N.) taiwanensis sp. n., male. A — wing. B — mid- and hind femur and tibia. C — tergites I, III – VII. D — hypopygium, dorsal view. E — hypopygium, ventral view.