Rheocricotopus (Rheocricotopus) shoufukusecundus 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 : 269-270

Rheocricotopus (Rheocricotopus) shoufukusecundus Sasa

( Figs 8 A–C )

Rheocricotopus (Rheocricotopus) shoufukusecundus Sasa, 1998: 30 ; Ashe & O’Connor 2012: 572.

Material examined. Holotype, male, Kurobe, Toyama Prefecture, Honshu, Japan. 13. III. 1997, (No. 329: 28).

Diagnostic characters. The species can be separated from other East Asian members of the genus by superior volsella absent, inferior volsella expanded apically and somewhat foot-shaped. Anal point sharp pointed and with 10 basal setae. Gonocoxite with many long setae.

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 1.6. Wing length / length of profemur 3.0. Outer verticals 2, postorbitals 4. Clypeus with 12 setae. Tentorium 185 µm long, 40 µm wide. Dorsocentrals 35, scutellars 13. Squama with 33 setae. Palpomeres length (in µm): –, 55, 110, 133, 158. Palpomere 2 ellipsoid, 3 and 4 rectangular, 5 long and slender, Palpomeres 5/3: 1.4. Laterosternite IX with 10 long setae. Anal point sharp pointed and 45 µm long, basal wide 13 µm, peak wide 3 µm, with 2 long lateral setae on each side and 9 basal setae. Transverse sternapodeme 188 µm long, with obvious oral projections. Gonocoxite 275 µm long. Gonostylus 58 µm long, with triangularly rounded costa dorsalis. Megaseta 13 µm long. HR 4.8, HV 7.4. The wing and hypopygium of holotype are re-drawn as in Figs 8 A–C .

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

Figures

FIGURE 8 A – C. Rhecricotopus (Rheocricotopus) shoufukusecundus Sasa, Male imago. A. Wing. B. Hypopygium, dorsal view. C. Hypopygium, ventral view.