Nanocladius (Nanocladius) trinus, 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 : 49-50

Nanocladius (Nanocladius) trinus sp. n.

( Fig. 4 A–D)

Type material. Holotype male, CHINA: Sichuan Province: Ganzi State, Yajiang County, 31°38'N, 99°58'E, 2.000 m a.s.l., 14.vi.1996, light trap, X. Wang (BDN No.12635). Paratypes: 3 males, same data as holotype (BDN Nos 12655, 13012, 13017).

Diagnostic characters. The species is similar to N. (N.) ortsi Lehman, 1979 in AR and LR, but can easily be separated on the long, slender phallapodeme, the shape of the inferior volsella and the coloration of abdomen

Etymology. From Latin, trinus , in three, referring to the coloration of the abdomen.

Male (n = 4). Total length 1.55–1.79, 1.64 mm. Wing length 1.13–1.28, 1.18 mm. Total length / wing length 1.3–1.4, 1.38. Wing length / length of profemur 3.2.

Coloration. Head, palp, and antenna dark brown. Thorax and legs dark brown. Abdominal tergites I–II yellow, tergites III–V dark brown, tergites VI–VIII brown.

Head. Antenna with 13 flagellomeres; ultimate flagellomere 130–190, 177 µm long, apex strongly expanded, with short sensilla chaetica. AR 0.32–0.42. Temporal setae absent. Clypeus with 6–8, 7 setae. Tentorium 113–148, 126 µm long; 10–15, 12 µm wide. Stipes 95–100, 98 µm long; 3 µm wide. Palpomeres length (in µm): 20–25, 23; 35–40, 38; 65–70, 68; 83–93, 90; 125–148, 114. Palpomere 5/3 1.9–2.3, 2.1.

Wing ( Fig. 4 A). VR 1.1–1.2, 1.1. Cu 450–520, 470 µm long. Squama and veins bare. Cu / wing length 0.39–0.41, 0.40. Wing width / wing length 0.36–0.42, 0.38.

Thorax. Dorsocentrals 6, prealars 1. Scutellum with 2 setae.

Legs. Spur of foretibia 28–35, 32 µm long; spurs of midtibia 15–20, 18 µm and 10 µm long; of hind tibia 28–35, 32 µm long. Hind tibial comb with 12–13, 12 setae. Width at apex of foretibia 20–25, 23 Μm; of midtibia 25–30, 28 Μm; of hind tibia 30–40, 36 Μm. Lengths and proportions of legs as in Table 4.

fe ti ta1 ta2 ta3 ta4

p1 350–400, 368 420–500, 453 245–300, 269 180–240, 215 130–160, 146 85–105, 93 p2 360–410, 381 340–420, 370 180–200, 185 110–135, 120 85–95, 82 40–50, 45 p3 350–420, 383 440–510, 465 235–270, 248 150–175, 161 100–125, 116 75–85, 80 ta5 LR BV SV BR

p1 50–70, 60 0.58–0.60, 0.59 2.0–2.3, 2.1 3.0–3.2, 3.1 2.0–2.5, 2.2 p2 45–53, 50 0.48–0.53, 0.50 3.0–3.1, 3.1 4.0–4.1, 4.0 2.4–3.2, 2.8 p3 55–63, 60 0.52–0.55, 0.53 2.6–3.3, 3.1 3.3–3.5, 3.4 2.6–3.3, 3.1 Abdomen ( Fig. 4 B). Number of setae on tergites I–VII: 8, 8, 8, 8, 8, 8, 5.

Hypopygium ( Fig. 4 C–D). Anal point 43–53, 50 Μm long. Tergite IX with several short setae; laterosternite IX with 1 long seta. Phallapodeme 50–55, 53 Μm long; transverse sternapodeme 65–70, 68 Μm long, with oral projections. Gonocoxite 125–140, 135 Μm long; with 8–10, 9 long setae. Inferior volsella well developed, triangular. Gonostylus 48–53, 50 Μm long, with several marginal setae in distal 1/3. HR 2.5–2.7, 2.6; HV 3.1–3.8, 3.5.

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

Figures

FIGURE 4. Nanocladius (N.) trinus sp. n., male. A — wing. B — tergites I, III – VII. C — hypopygium, dorsal view. D — hypopygium, ventral view.