Polypedilum (Polypedilum) hainanense, Zhang, Ruilei & Wang, Xinhua, 2008

Zhang, Ruilei & Wang, Xinhua, 2008, Three new species of Polypedilum s. str. Kieffer from China, with L-shaped superior volsella (Diptera: Chironomidae), Zootaxa 1702, pp. 61-68 : 65-67

Polypedilum (Polypedilum) hainanense sp. nov.

( Fig. 3 )

Type material: Holotype male, CHINA: Hainan Province, Changjiang County, Bawangling Nature Reserve, 11.v.1989, light trap, X. Wang (BDN. No. 05834). Paratype: 1 male, data as in holotype.

Etymology: Named after the type locality.

Diagnostic characters: The species differs from other members of the subgenus by the following combination of characters: squama with 3 setae; R4+5 with 14–20 setae; a high foreleg ratio (2.36); and nearly Lshaped superior volsella lacking basal inner setae.

Male (n = 2)

Total length 1.90–1.95 mm. Wing length 1.15–1.25 mm. Total length / wing length 1.56–1.65. Wing length / length of profemur 2.05–2.30.

Coloration. Head brown with yellow palpomeres. Thorax yellowish brown with darker vittae, postnotum and preepisternum; halteres dark brown. Foreleg brown; mid and hind legs with femora and tibiae yellowish brown, tarsi yellow. Abdominal segment I and hypopygium brown, other segments yellow.

Head. AR 0.80–1.08; ultimate flagellomere 280–390 µm long. Temporal setae 7–9, including 2 inner verticals, 4 outer verticals, and 1–3 postorbitals. Clypeus with 7–9 setae. Tentorium 95–98 µm long; 15–20 µm wide. Palpomere lengths (in µm): 20–23, 28–30, 53–68, 68–73, 100–103.

Wing ( Fig. 3 A). VR 1.30–1.35. R with 16–18 setae, R1 with 2–6, R4+5 with 14–20 setae. Squama with 3 setae. Anal lobe weak.

Thorax. Dorsocentrals 10, including 2 humerals; acrostichals 7–10; prealars 2–3. Scutellum with 6–8 setae.

Legs. Scale of foretibia 23–25 µm long, triangular with rounded apex ( Fig. 3 B). Spur of midtibia 43–45 µm long, including 23–25 µm long comb; un-spurred comb 20–23 µm long. Spur of hind tibia 48–50 µm long, including 25–28 µm long comb; un-spurred comb 20–23 µm long. Width at apex of foretibia 38–38 µm, of midtibia 35–38 µm, of hind tibia 38–40 µm. Lengths (in µm) and proportions of legs as in Table 3 .

Hypopygium ( Fig. 3 C–E). Anal tergite bands not fused basally. Tergite IX with 2–4 median setae. Laterosternite with 2–3 setae. Anal point 23–32 µm long, slender, with basal half tapering and apical half parallelsided. Phallapodeme 63–65 µm long, transverse sternapodeme 40–43 µm long. Gonocoxite 95–125 µm long. Superior volsella ( Fig. 3 C) abruptly bent medially, with 1 strong lateral seta medially and 2–3 short, subapical seta. Inferior volsella 95–125 µm long, slender, apically swollen, with 1 strong apical seta projecting caudad, and 9–12 orally directed setae some of which are split apically. Gonostylus 118–135 µm long, with 5–6 setae along inner margin and 1 apical seta. HR 0.81–0.93; HV 1.44–1.50, 1.61.

Distribution. The species was collected in a mountain area in Hainan Province in Oriental China.

Figures

FIGURE 3. Polypedilum (Polypedilum) hainanense sp. nov., male imago. A. Wing. B. Fore tibial scale. C. Superior volsella. D. Hypopygium, dorsal view. E. Hypopygium, ventral view.

Tables

TABLE 3. Lengths (in µm) and proportions of legs of Polypedilum (Polypedilum) hainanense sp. nov., male (n = 1 – 2).

	fe	ti	ta1	ta2	ta3	ta4	ta5	LR
p1	500–610	280–330	660	340	290	175	95	2.36
p2	540–610	360–440	250–285	120	95–100	53–55	45–48	0.65–0.69
p3	600–700	460–540	400	200	180	110	60	0.74