Polypedilum (Uresipedilum) convictum (Walker, 1856)

Zhang, Ruilei & Wang, Xinhua, 2004, Polypedilum (Uresipedilum) Oyewo and Saether from China (Diptera: Chironomidae), Zootaxa 565 (1), pp. 1-38 : 9-12

Polypedilum (Uresipedilum) convictum (Walker, 1856)

( Fig. 4 )

Chironomus convictus Walker, 1856: 161 .

Polypedilum convictum: Goetghebuer 1928: 92 ; Pinder 1978; fig.168; Rossaro 1985: 22, fig.10; Sasa & Kawai, 1987: 30.

Polypedilum (Polypedilum) convictum: Niitsuma 1992: 697 .

Polypedilum (Uresipedilum) convictum: Oyewo & Saether 1998: 334 ; Wang 2002: 646.

Material examined: 20males, CHINA: Fujian Province, Yongtai County; 16. 17. 19. IX. 2002; Z. Liu . 1 male, Fujian Province, Jianning County, County seat; 25. IX. 2002; Z. Liu . 1 male, Henan Province, Luanchuan County, Longyuwan , 10. VII. 1996, J. Li . 2 males, Hubei Province, County, Shennongjia Natural Conservation , Hongping , 18. VII. 1997, Y. Du. Guangdong Province, Shixing County, Chebaling ; 9. VIII. 1992; L. Zheng ; 3 males. 1 male, Hainan Province, Lishui County, Diaoluo Town . 20. V. 1988, light trap, X. Wang . 1 male, Hainan Province, Changjiang County, Bawangling Natural Conservation , 11. v. 1989, X. Wang . 1 male, Guizhou Province, Fanjing Mountains Natural Conservation, Huoguo temple, 2. VIII. 2001, R. Zhang . 1 male, Guizhou Province, Fanjing Mountains Natural Conservation, 29. V. 2002, B. Ji . 1 male, Guizhou Province, Wangmo County, 11. VIII. 1995, W. Bu . 2 males, Yunnan Province, Lijiang City, Shigu, Chongjiang River ; 25. V. 1996; 1850m, C. Zhou; light trap . 8 males, Shannxi Province, Liuba County, Miaotaizi Town ; 1. 2. 4. VIII. 1994, B. Ji . 7 males, Shannxi Province, Ningshan County, Huoditang , 12. 13. 14. VIII. 1994, B. Ji . 2 males, Shannxi Province, Ningshan County, Xunyanba , 17. VIII. 1994, B. Ji . 2 males, Shannxi Province, Feng County, Qinling Mountain , 26 VIII. 1994, B. Ji .

Diagnostic characters: Differs from other light species of the subgenus in having the superior volsella projected posteriorly.

Male imago (n = 13, except when otherwise stated)

Total length 2.59–3.43, 2.91 mm. Wing length 1.48–1.89, 1.65 mm. Total length/ wing length 1.57–2.05, 1.77. Wing length /length of profemur 1.81–2.28, 2.06(12).

Coloration. Entirely pale yellow to yellow except pale brown foretarsi.

Head. AR 1.41–1.94, 1.72. Temporal setae 8–13, 10; including 2–5, 3 inner verticals; 2–5, 4 outer verticals and 1–4, 3 postorbitals. Clypeus with 10–21, 14 setae. Tentorium 117–153, 131 m long, 2339, 33 m wide. Palpomere lengths (in m): 28–49, 38; 34–42, 37; 108–151, 127; 96–135, 117; 173–239, 207.

Wing ( Fig. 4A ). VR 1.17–1.30, 1.23. Brachiolum with 1 setae, R with 16–25, 20; R 1 with 11–18, 15; R 4+5 with 21–30, 24. Squama with 6–11, 8 setae.

Thorax. Dorsocentrals 10–16, 12; acrostichals 8–23, 12(9); prealars 4–5, 4. Scutellum with 12–17, 14 setae.

Legs. Terminal scale ( Fig. 4B ) of front tibia oval, 21–45, 28 m long; spur on median tibiae 44–57, 50 µm long including 21–29, 25 m long comb, un­spurred comb 20–23, 21 m long, spur on posterior tibia 49–62, 53 m long including 23–31, 27 m long comb, un­spurred comb 21–28, 23 m long. Width at apex of front tibia 34–49, 46 m, of middle tibia 42–55, 49 m, of hind tibia 44–60, 51 m. Lengths (in m) and proportions of legs ( Table 4):

Hypopygium ( Figs. 4C–G ). Anal tergite bands moderately developed, fused basal to median anal tergite setae. Anal tergite with 5–14, 8 median setae, laterosternite with 2–4, 3 setae. Anal point 49–70, 55 m long gradually to nearly parallel­sided. Phallapodeme 78– 81, 80 m long; transverse sternapodeme 28–42, 34 m long. Gonocoxite 120–143, 129 m long. Superior volsella 34–57, 43 m long slightly projected posteriorly; base with 13 inner setae and 1 apical seta, microtrichiae present at apex. Inferior volsella 78–94, 84 m long slightly swollen subapical, with 14–19 setae and a prominent apical seta. Gonostylus 109–148, 130 m long. HR 0.90–1.12, 1.00. HV 2.00–2.40, 2.22.

Distribution: The species is widespread in the Palaearctic region. It occurs both in Palaearctic and Oriental China. This is the first record for the Oriental Region.

Remarks: The species is most similar to P. (U.) flavum (Johannsen) . Maschwitz & Cook (2000) mentioned that P. (U.) convictum and P. (U.) flavum are indistinguishable in the adult stage, but they treated them as separated species based on the differences in immature stages.

Figures

FIGURE 4. Polypedilum (Uresipedilum) convictum (Walker), Chinese specimen. A. Wing. B. Fore tibia scale. C­E. Superior volsella. F. Dorsal view of hypopygium. G. Ventral view of hypopygium.

Tables

TABLE. 4. Polypedilum (Uresipedilum) convictum (Walker). Lengths of legs (in m).

	fe	ti	ta1	ta2	ta3	ta4	ta5	LR
p1	735–924,	450–588,	809–1050,	620–788,	410–546,	336–431,	137–179,	1.67–1.94,
	810(12)	505	1001(11)	686(11)	471(11)	384(11)	156(11)	1.78(11)
p2	756–977,	630–830,	336–441,	210–252,	143196,	851–17,	57–74,	0.51–0.61,
	855	697	393(12)	232(12)	166(12)	103(12)	63(12)	0.56(12)
p3	800–1019,	693–893,	494–651,	273–357,	230–305,	147–186,	74–95,	0.69–0.79,
	893	777	567	311	256	158	80	0.73