Polypedilum (Tripodura) cypellum Qi et al.

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 : 15

Polypedilum (Tripodura) cypellum Qi et al.

Polypedilum (Tripodura) cypellum Qi et al., 2014: 120 .

Material examined. Holotype, male, CHINA: Zhejiang Province, Zhoushan City, Putuo District, Dengbu Village, Xishan Island, 30. V. 2013, sweep net, Q. Xin.

Diagnostic characters. The male imago can be distinguished from other members of the subgenus by the following combination of characters: superior volsella goblet-shaped, covered with microtrichia and with 19 setae on distal margin; anal point without lateral projection; terminal scale of rounded, without spur.

Key characters of male imago. Total length 2.60 mm, wing length 1.55 mm. Femur and tibia with two rings. AR 0.83, temporal setae 11, clypeus with 20 setae. Acrostichals 15, dorsocentrals 18, prealars 3, scutellum with 9 setae. Wing with dark spots, R with 19 setae, R1 with 10, R4+5 with 14, squama with 3 setae. Terminal scale of fore tibia rounded, without spur; front leg ratio 1.55.

Tergite IX with 5 strong median setae and 6 setae at base of anal point. Laterosternite with 4 setae. Anal point broad, apically rounded, without lateral projections. Superior volsella 78 µm long, 68 µm wide, goblet-shaped, hollow; covered with microtrichia, with 19 setae on distal margin. Inferior volsella 170 µm long, digitiform, apex narrowed, with 22 long setae. Gonostylus apex narrowed, with 10 long setae along inner margin. HR 1.00, HV 1.36.

Distribution. The species distributes in a sea island of Zhejiang Province, Oriental China.

Remarks. This species resembles P. (T.) harteni Andersen & Mendes, 2010 but is separated from the latter by goblet-shaped superior volsella (pediform in P. (T.) harteni ), the gonostylus slender and apex narrowed (apex rounded and swollen in P. (T.) harteni ), anal point with 6 setae at base (anal point with two row of short dorsal setae, each row with 8–10 setae in P. (T.) harteni ).