Polypedilum (Uresipedilum) surugense Niitsuma, 1992

Zhang, Ruilei & Wang, Xinhua, 2004, Polypedilum (Uresipedilum) Oyewo and Saether from China (Diptera: Chironomidae), Zootaxa 565 (1), pp. 1-38 : 31-33

Polypedilum (Uresipedilum) surugense Niitsuma

( Fig. 13 )

Polypedilum (Polypedilum) surugense Niitsuma, 1992:700 .

Material examined: CHINA: 1 male, Fujian Province, Daiyun Mountains Natural Conservation, Houzhai Village ; 15. IX. 2002, Z. Liu . 2 males, Hubei Province, Xianfeng County, Maheba ; 400m, 25. VII. 1999, B. Ji; sweep net . 20 males, 1 male, Guizhou Province, Fanjing Mountains Natural Conservation, Huoguo Temple; 2. VIII. 2001, R. Zhang. Yunnan Province, Lijiang City , Shigu Town , Chongjiang River ; 25. V. 1996; 1850m, C. Zhou, light trap . 8 males, Shannxi Province, Feng County, Qinling Mountain ; 2627. 29. VII. 1994; B. Ji . 1 male, Shannxi Province, Liuba County, Miaotaizi , 1400m; 2. VIII. 1994, B. Ji .

Diagnostic characters: Differs from other members of the subgenus in having a broad anal point and a slender, pointed apicomedial projection on superior volsella.

Male imago (n = 9 except when otherwise stated)

Total length 2.86–3.94, 3.45 mm. Wing length 1.48–2.27, 1.88 mm. Total length/ wing length 1.74–1.93, 1.85. Wing length /length of profemur 1.88–2.68, 2.16.

Coloration. Head yellow brown, antennae brown. Thorax yellow, scutellum and haltere pale. Legs yellow except yellow brown foretarsi. Abdominal segments yellow or pale yellow.

Head. AR 1.45–1.90, 1.71. Temporal setae 10–13, 11; including 3–5, 4 inner verticals; 4–6, 5 outer verticals and 2–4, 3 postorbitals. Clypeus with 15–20, 17 setae. Tentorium 130–164, 122 m long, 31–39, 35 m wide. Palpomere lengths (in m): 29–44, 37; 42–62, 49; 125–161, 149; 107–156, 138; 203–252, 208.

Wing ( Fig. 13A ). VR 1.16–1.32, 1.22. Brachiolum with 1 setae, R with 17–22, 20; R 1 with 12–19, 16; R 4+5 with 19–32, 26. Squama with 8–12, 11 setae.

Thorax. Dorsocentrals 12–15, 14; acrostichals 12–16, 14; prealars 4–5, 4. Scutellum with 11–20, 14 setae.

Legs. Terminal scale ( Fig. 13B ) of front tibia oval, 23–34, 29 m long; spur on median tibiae 44–55, 50 µm long including 23–31, 27 m long comb, un­spurred comb 21–34, 25 m long, spur on posterior tibia 57–65, 60 m long including 29–36, 32 m long comb, un­spurred comb 26–31, 28 m long. Width at apex of front tibia 47–57, 53 m, of middle tibia 47–65, 56 m, of hind tibia 52–73, 62 m. Lengths (in m) and proportions of legs ( Table 13):

Hypopygium ( Figs. 13C–E ). Anal tergite with 10–12, 11 median setae, laterosternite with 2–4, 3 setae. Anal point 73–99, 84 m long, broad and tapering. Transverse sternapodeme 36–60, 47 m long. Gonocoxite 146–172, 158 m long. Superior volsella 44–57, 49 m long strongly projected posteriorly, with pronounced heel and microtrichiae at apex, base with a long apical seta and 01 inner seta; apicomedial projection 33–44, 36 m long, slender and pointed at apex. Inferior volsella 91–120, 104 m long, laterally broadened subapically with 12–18, 15 setae and a prominent apical seta. Gonostylus 147–182, 162 m long. HR 0.91–1.05, 0.98. HV 1.82–2.42, 2.13.

Distribution: The species was previously known only from Japan ( Niitsuma 1992). This is the first record from the Oriental Region (five provinces of southern China).

Remarks: The species resembles P. (U.) paraviceps Niitsuma from Japan, but differs in several characters. The superior volsella has 0–1 inner setae in P. (U.) surugense , 2–3 in P. (U.) paraviceps . The inferior volsella has a ventral tubercle P. (U.) paraviceps , but without in P. (U.) surugense .

Figures

FIGURE 13. Polypedilum (Uresipedilum) surugense Niitsuma, Chinese specimen. A.Wing. B. Fore tibia scale. C. Superior volsella. D. Dorsal view of hypopygium. E. Ventral view of hypopygium.