Polypedilum (Tripodura) bispinum Zhang & Wang

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 : 12

Polypedilum (Tripodura) bispinum Zhang & Wang

Polypedilum (Tripodura) bispinum Zhang & Wang, 2007: 787 .

Material examined. Holotype male (BDN No.05880), CHINA: Hainan Province, Lishui County, Diaoluo Town. 20. V. 1988, light trap, X. Wang.

Diagnostic characters. The species differs from other members of the subgenus in having spatulate anal point, clavate superior volsella and developed lateral projection of anal point.

Key characters of male imago. Total length 1.86 mm, wing length 1.08 mm. AR 0.82, temporal setae 9, clypeus with 12 setae. Wing with plain markings, R with 14 setae, R1 with 6 setae, R4+5 with 15 setae, squama with 3 setae. Dorsocentrals 11, acrostichals 8, prealars 3, scutellum with 7 setae. Terminal scale of front tibia triangular without spur, leg ratio of front tibia 1.86.

Anal tergite bands weak, separate at base, tergite IX with 4 median setae. Anal point broad, spatulate; developed lateral projections covered with microtrichia. Superior volsella with 2 strong diageotropic inner setae in middle, 1 outer sub-apical seta and about 12 thin inner setae present from middle to apex. Inferior volsella with 5 oral setae and 1 apical seta. HR 0.85. HV 1.84.

Distribution. The species distributes in Oriental China.

Remarks. The species closely resembles P. (T.) nudiprostatum Zhang, Wang & Saether, 2006 , but differs in wing with two spots in cell r4+5, apex of cell m1+2 and m3+4 cloudy, anal point spatulate, lateral projections of anal point covered with microtrichiae, the inner setae of superior volsella situated in middle; while in P. (T.) nudiprostatum Zhang, Wang & Saether , wing with one spot in cell r4+5, apex of cell m1+2 and m3+4 clear, anal point is broad, lateral projections of anal point bare and strongly sclerited, the inner setae of superior volsella situated at distal 1/4.