Rheocricotopus (Psilocricotopus) kurocedeus Sasa

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 : 264-265

Rheocricotopus (Psilocricotopus) kurocedeus Sasa

( Figs 3 A–C )

Rheocricotopus (Psilocricotopus) kurocedeus Sasa, 1996: 19 ; Ashe & O’Connor 2012: 565.

Material examined. Holotype, male, Kuroyon Lake, Toyama Prefecture, Honshu, Japan. 14. X. 1994, light trap (No. 284: 31).

Diagnostic characters. The species can be separated from other East Asian members of the genus by inferior volsella rounded and double-layered, anal point with 2 long lateral setae on each side, gonostylus almost straight and median expanded, with small triangularly pointed costa dorsalis.

Additional description and corrections. Based on the analysis of holotype material, the examined characters were consistent with the original description, b u t some additional characters should be added: Total length / wing length 1.5. Wing length / length of profemur 2.8. Outer verticals 4. Tentorium 150 µm long, 45 µm wide. Palpomeres length (in µm): 33, 53, 110, 120, 213. Palpomere 2 ellipsoid, 3 and 4 rectangular, 5 long and slender, Palpomeres 5/3: 1.9. Laterosternite IX with 7 long setae. Anal point 48 µm long, basal wide 15 µm, peak wide 3 µm, with 2 long lateral setae on each side. Transverse sternapodeme 115 µm long, without oral projections. Superior volsella reduced. Gonocoxite 188 µm long. Gonostylus 70 µm long, with small triangularly pointed costa dorsalis. Megaseta 15 µm long. HR 2.7, HV 3.9. The wing and hypopygium of holotype are re-drawn as in Figs 3 A–C .

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

Figures

FIGURE 3 A – C. Rhecricotopus (Psilocricotopus) kurocedeus Sasa, Male imago. A. Wing. B. Hypopygium, dorsal view. C. Hypopygium, ventral view.