Polypedilum (Tripodura) masudai (Tokunaga)

Zhang, Ruilei, Song, Chao, Qi, Xin & Wang, Xinhua, 2016, Taxonomic review on the subgenus Tripodura Townes (Diptera: Chironomidae: Polypedilum) from China with eleven new species and a supplementary world checklist, Zootaxa 4136 (1), pp. 1-53 : 20-22

Polypedilum (Tripodura) masudai (Tokunaga)

( Figure 8 )

Chironomus (Polypedilum) masudai Tokunaga, 1938: 331 .

Polypedilum masudai (Tokunaga) , Wang 1977: 232; Sasa 1985: 44; Sasa & Kikuchi 1986: 24, Ree & Kim 1988: 14; Wang 2000: 646.

Polypedilum (Tripodura) tobadecima Kikuchi & Sasa, 1990: 309 . Syn. n.

Polypedilum (Tripodura) masudai (Tokunaga) , Sasa, 1991: 84; Tang et al. 2014: 423 .

Material examined. 2 males, CHINA, Fujian Province, Jianning County, the forestry bureau of county town, 25.

IX. 2002; light trap, Z. Liu. 6 males, Fujian Province, Nanping City, Maodi Town, 23. IX. 2002; light trap, Z. Liu. 6 males, Fujian Province, Fuzhou City, Fuzhou Agricultural College, 22. IV. 1993, light trap, X. Wang. 1 male, Henan Province, Xinyang City, Mountain Jigongshan, 500m, 13, VII. 1997, Y. Du. 5 males, Hunan Province, Poyanghu Lake, Mountain nanjishan, 12. VI. 2004, C. Yan, sweep net. 1 male, Guangxi Autonomous Region, Longsheng County, Sanmen Town, 27. V. 1990, X. Wang. 4 males, Hainan Province, Changjiang County, Bawangling Natural Reserve, 11. V. 1989, light trap, X. Wang. 3 males, Guizhou Province, Libo County, Maolan Natural Reserve, Sancha River, 420m, 28. VII. 1995, light trap, W. Bu. 1 male, Guizhou Province, Libo County, Maolan Natural Reserve, Xi’ang, 700m, 3. VIII. 1 995, light trap, W. Bu.

Diagnostic characters. The species can be separated from the other members of the subgenus by hind margin of tergite IX acutely angulated, the slender anal point without lateral projections at base and wing pattern with nine markings.

Male imago (n=13, when otherwise stated). Total length 2.43–3.33, 2.80 (11) mm. Wing length 1.32–1.86, 1.54 mm. Total length/ wing length 1.75–2.04, 1.86 (11). Wing length /length of profemur 2.12–2.41, 2.26 (12).

Coloration. Head and halteres brown, thorax dark brown. Abdominal segments brown. All femora dark brown basal 2/3 and yellowish brown on distal 1/3, fore tibia yellowish brown, tarsi I to IV largely yellowish brown with dark ring in the middle, tarsi V largely brown. In middle and hind legs, the dark ring less conspicuous.

Head. AR 1.32–1.66, 1.44. Ultimate flagellomere 515–662, 581 µm long. Temporal setae 8–12, 10, including 2–3, 3 inner verticals, 3–6, 5 outer verticals and 1–4, 2 postorbitals. Clypeus with 13–24, 16 (12) setae. Tentorium 104–130, 116 (12) µm long, 21–31, 27 (12) µm wide. Palpomere lengths (in µm): 26–44, 34; 31–39, 35; 88–112, 98; 91–127, 114; 143–205, 172.

Wing ( Figure 8A ). Wing with 9 markings, 3 in cell r4+5, 2 in cell m1+2, 2 in cell m3+4, 1 in cell cu1, 1 in cell an. VR 1.14–1.28, 1.21. R with 16–23, 19 setae; R1 with 10–15, 12; R4+5 with 16–22, 19. Squama with 5–13, 7 (10) setae.

Thorax. Dorsocentrals 10–14, 12; acrostichals 11–16, 14 (11); prealars 3–5, 4. Scutellum with 7–12, 11 setae.

Legs. Terminal scale ( Figure 8B ) of front tibia 26–39, 32 µm long, oval and apically rounded. Spur of middle tibia 44–62, 52 um long including 18–31, 24 µm long comb, un-spurred comb 18–23, 21 µm long, spur on hind tibia 49–65, 58 µm long including 21–31, 26 µm long comb, un-spurred comb 21–31, 26 µm long. Width at apex of front tibia 36–52, 42 µm, of middle tibia 42–52, 47 µm, of hind tibia 44–60, 52 µm. Lengths (in µm) and proportions of legs as in Table 1 .

Hypopygium ( Figure 8C, D ) Tergite IX with 7–11, 9 median setae. Laterosternite with 2 setae. Hind margin of tergite IX acutely angulated at the base of anal point, without lateral projection flanking anal point. Anal point 36– 52, 46 µm long, slender, tapering from base to parallel-sided apex. Phallapodeme 55–90, 68 µm long; transverse sternapodeme 31–55, 40 µm long. Gonocoxite 117–148, 135 µm long. Superior volsella ( Figure 8C ) pad–like, expanded distally, with 3–4 short inner setae and 3–5 long apical setae. Inferior volsella 78–104, 90 µm long with 11–15, 14 oral setae and 1 apical seta. Gonostylus 117–169, 139 µm long, with 5–6 long setae along inner margin. HR 0.85–1.18, 0.98. HV 1.82–2.42, 2.06.

Distribution. The species distributes in Russian Far East, Korea, Japan, China and Indonesia.

Remarks. P. (T.) tobadecima Kikuchi & Sasa, 1990 is here synonymised because the morphological characters of male are identical with P. (T.) masudai ( Tokunaga, 1938) according to original description and photographs provided by type specimen database of National Museum of Nature and Sciences of Japan (http:// www. type.kahaku.go.jp/TypeDB/ diptera/294).

Figures

FIGURE 8 A – D. Polypedilum (Tripodura) masudai (Tokunaga). A. Wing. B. Fore tibial scale. C. Superior volsella. D. Hypopygium, dorsal and ventral view.