Polypedilum (Tripodura) decematoguttatum (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 : 15-16

Polypedilum (Tripodura) decematoguttatum (Tokunaga)

Chironomus (Polypedilum) decematoguttatum Tokunaga 1938: 337 .

Polypedilum (Tripodura) tobanona Kikuchi & Sasa 1990: 308 . Syn. n.

Polypedilum decematoguttatum (Tokunaga) , Ree et al 2010: 208.

Polypedilum (Tripodura) decematoguttatum (Tokunaga) , Sasa 1995: 39, 118, 242; Xu et. al. 2014: 1554.

Material examined: 4 males, Fujian Province, Jianning County, the forestry bureau of county town, 25. IX. 2002; light trap, Z. Liu. 3 males, Yunnan Province, Menglun County, 12. IV. 1987. light trap, H. Zou.

Diagnostic characters. The male imago differs from other members of the subgenus by the wing with ten markings, anal point with two small lobes to each side a, the broad pad-like superior volsella with 4–6 consipicuous inner setae and 1 long outer apical seta.

Key characters of male imago. Total length 3.54–4.10, 3.91 mm, wing length 1.94–2.08, 2.03 mm. AR 1.80– 1.95, 1.87. Temporal setae 6–12, 9; clypeus with 25–32, 28 setae. Wing with ten markings, 3 in cell r4+5, 1 in cell m, 2 in cell m1+2, 1 in cell m3+4, 2 in cell Cu1, 1 in cell an; R with 20–31, 24 setae; R1 with 17–27, 22; R4+5 with 22–29, 25; squama with 10–14, 12 setae. Dorsocentrals 15–19, 18; acrostichals 13–19, 17; prealars 4–7, 5; scutellum with 16–21, 18 setae. Femur dark brown with a yellow ring on distal 1/4; terminal scale of front tibia oval with a small spur; front leg ratio 1.81–1.86, 1.83.

Tergite IX with 10–19, 13 median setae. Anal point with two small lobes to each side. Superior volsella swollen apically, with 4–6 consipicuous inner setae and 1 long outer apical seta. Inferior volsella almost parallelsided with 17–21 oral setae and 1 apical seta. HR 0.86–1.05, 1.00. HV 1.95–2.28, 2.05.

Distribution. It is known from Japan, Korea, Indonesia and Oriental China.

Remarks. The species is very close to P. (T.) tobanona Kikuchi & Sasa, 1990 from Indonesia. According to Kikuchi & Sasa (1990: fig15a), wing has 7 markings in P. (T.) tobanona . P. (T.) decematoguttatum has 10 wing markings, however, the wing markings of P. (T.) decematoguttatum are obscure near margin. According to the photograph of holotype of P. (T.) tobanona Kikuchi & Sasa provided by National Museum of Nature and Sciences of Japan (http://www. type.kahaku.go.jp/TypeDB/diptera/283), wing has 10 markings in P. (T.) tobanona . Except for the above two difference, there is no other difference between the two species, so we treat P. (T.) tobanona Kikuchi & Sasa as a new synonym of P. (T.) decematoguttatum Tokunaga.

In the subgenus Tripodura , there are other six species, P. (T.) bicrenatum Kieffer , P. (T.) digitifer Townes , P. (T.) halterale (Coquillet) , P. (T.) simulans Townes , P. (T.) sidoniensis Moubayed and P. (T.) tetracrenatum Hirvenoja having characteristic anal point with a pair of small lobes to each side.