Paracladius akansextus Sasa et Kamimura

Fu, Yue, Wang, Xinhua & Andersen, Trond, 2010, Chinese Paracladius Hirvenoja, with the description of P. ovatus sp. n. (Chironomidae: Orthocladiinae), Zootaxa 2453, pp. 62-68 : 63

Paracladius akansextus Sasa et Kamimura

( Figs 1–4 )

Paracladius akansextus Sasa et Kamimura, 1987: 31 .

Paracladius akansextus Sasa et Kamimura ; Yamamoto (2004: 63).

Material examined. JAPAN: Hokkaido, Kushiro, Lake Kussharo, holotype male, 26.ix.1998, H. Suzuki (No. 101: 56). CHINA: Hebei Province, Weichang County, Qipan Town, 42°10'N, 117°57'E, 1.800 m a.s.l., 2 males, 16–17.vii.2001, light trap, Yuhong Guo (BDN No. 23357, 23399); Xinjiang Autonomous Region, Tacheng City, Yemenle Town, 46°44'N, 82°58'E, 1.550 m a.s.l., 1 male, 25.vii.2002, light trap, Hongqu Tang (BDN No. 21257).

Emended description. Male (n = 4). Total length 3.20–3.80, 3.40 mm. Wing length 1.80–2.30, 2.00 mm. Total length / wing length 1.70–1.80. Wing length / length of profemur 2.30–2.80, 2.50. Tentorium 135–165, 155 µm long; 35–50, 45 µm wide. Clypeus with 10–13, 11 setae. Palpomeres length (in µm): 30–35, 32; 45–55, 50; 90–120, 110; 75–110, 100; 113–170, 155. Palpomere 5/3: 1.3–1.5, 1.4. Costal extension 30–50, 42 µm long. R with 6 setae. Squama with 11–15, 13 setae. Spur of fore tibia 53–58, 55 µm long; spurs of mid tibia 23–28, 25 µm and 20–25, 23 µm long; spurs of hind tibia 58 µm and 23–25, 24 µm long. Hind tibial comb with 10 setae. Width at apex of fore tibia 43–48, 46 µm; of mid tibia 45 µm; of hind tibia 45–55, 50 µm. Sensilla chaetica 6–8 on ta1 of hind leg. Lengths and proportions of legs as in Table 1. Anal point 30–35, 32 µm long; with 6 lateral setae. Tergite IX with 14 additional setae; laterosternite IX with 6–8 setae. Transverse sternapodeme 128–140, 132 µm long. Gonocoxite 220–270, 255 µm long. Gonostylus 90–100, 94 µm long, with broadly rounded to triangular crista dorsalis; megaseta 10–15, 13 µm long. HR 2.4–2.8, 2.6; HV 3.6–3.8, 3.7. The wing and hypopygium of a Chinese specimen is shown in Figures 1–4 .

Remarks. Most measurements of the Chinese specimens are within the same range as the holotype. However, the Chinese specimens have an AR of 1.35–1.66 while the Japanese holotype has an AR of 1.26.

Distribution. The species is distributed in Japan and Palaearctic China.

Figures

FIGURES 1 – 4. Paracladius akansextus Sasa et Kamimura, 1987, male. 1 – wing; 2 – hypopygium, dorsal view; 3 – hypopygium with anal point and tergite IX removed, dorsal aspect to the left, ventral aspect to the right; 4 – gonostylus, ventral view.