Rheocricotopus (Psilocricotopus) tokarakeleus 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 : 266-267

Rheocricotopus (Psilocricotopus) tokarakeleus Sasa & Suzuki

( Figs 5 A–C )

Rheocricotopus (Psilocricotopus) tokarakeleus Sasa & Suzuki, 1995: 270 ; Ashe & O’Connor 2012: 567.

Material examined. Holotype, male, Kuchinoshima, Kokara, Kagoshima Prefecture, Japan. 19. V. 1994. (No. 287: 37).

Diagnostic characters. The species can be separated from other East Asian members of the genus by laterosternite IX with 7 long setae, anal point with 5 long lateral setae on each side, superior volsella with rounded corner, inferior volsella slightly hooked, gonostylus with a triangular pointed crista dorsalis.

Additional description and corrections. Based on the examination of holotype material, we found the character consistent with the original description. But some additional characters should be added: Total length / wing length 1.9. Wing length / length of profemur 2.4. Tentorium 133 µm long, 30 µm wide. Brachilous 1. Dorsocentrals 15, scutellars 10. Palpomeres length (in µm): 35, 50, 120, 158, 210. Palpomere 2 ellipsoid, 3 rectangular, 4 and 5 long and slender, Palpomeres 5/3: 1.8. Laterosternite IX with 7 long setae. Anal point 40 µm long, basal wide 15 µm, peak wide 3 µm, with 5 long lateral setae on each side. Transverse sternapodeme 100 µm long, with oral projections. Gonocoxite 220 µm long. Gonostylus 100 µm long, with triangular crista dorsalis. Megaseta 13 µm long. HR 2.2, HV 3.7. The wing and hypopygium of holotype are re-drawn as in Figs 5 A–C .

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

Figures

FIGURE 5 A – C. Rhecricotopus (Psilocricotopus) tokarakeleus Sasa & Suzuki, Male imago. A. Wing. B. Hypopygium, dorsal view. C. Hypopygium, ventral view.