Rheocricotopus (Rheocricotopus) yakulemeus Sasa & Suzuki

Fu, Yue, Huang, Jingli, Liu, Wenbin, Fang, Xiangliang & Wang, Xinhua, 2016, Redescription of 13 holotypes of Rheocricotopus Brundin, 1956 (Diptera: Chironomidae) from the Sino – Indian Region, Zootaxa 4114 (3), pp. 261-276 : 274

Rheocricotopus (Rheocricotopus) yakulemeus Sasa & Suzuki

( Figs 13 A–C )

Rheocricotopus (Rheocricotopus) yakulemeus Sasa & Suzuki, 2000: 69 ; Ashe & O’Connor 2012: 573.

Material examined. Holotype, male, Nagata, Yakushima Island, Kagoshima Prefecture, Japan. 23. III. 1999. (No. 381: 44).

Diagnostic characters. The species can be separated from other East Asian members of the genus by laterosternite IX with 1 long seta, anal point with 5 long lateral setae on each side, inferior volsella developed and double-layered, with a small lobe.

Additional description and corrections. Based on the analysis of holotype material, the examined characters were consistent with the original description, but some additional characters should be added: Total length / wing length 2.0. Wing length / length of profemur 2.5. Tentorium 155 µm long, 38 µm wide. Dorsocentrals 20. Palpomeres length (in µm): 45, 63, 100, 125, 198. Palpomere 2 ellipsoid, 3 and 4 rectangular, 5 long and slender, Palpomeres 5/3: 2.0. Laterosternite IX with 2 long setae. Anal point 45 µm long, basal wide 32 µm, peak wide 10 µm, with 5 long lateral setae on each side. Transverse sternapodeme 65 µm long, with weak oral projections. Gonocoxite 195 µm long. Gonostylus 83 µm long, with triangular crista dorsalis. Megaseta 15 µm long. HR 2.4, HV 3.6. The wing and hypopygium of holotype are re-drawn as in Figs 13 A–C .

Distribution. The species occurs in Japan (Palaearctic Region).

Figures

FIGURE 13 A – C. Rhecricotopus (Rheocricotopus) yakulemeus Sasa & Okazawa, Male imago. A. Wing. B. Hypopygium, dorsal view. C. Hypopygium, ventral view.