Rheocricotopus (Rheocricotopus) tatequintus 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 : 271-272

Rheocricotopus (Rheocricotopus) tatequintus Sasa

( Figs 10 A–C )

Rheocricotopus (Rheocricotopus) tatequintus Sasa, 1996: 32 ; Ashe & O’Connor 2012: 572.

Material examined. Holotype, male, Toyama Prefecture, Honshu, Japan. 9. IV. 1986, light trap (No. 284: 58).

Diagnostic characters. The species can be separated from other East Asian members of the genus by AR 2.55, superior volsella developed and horn-like, inferior volsella extended and acutely angular, anal point sharp pointed and with 4 basal setae.

Additional description and corrections. AR should be 2.55. Clypeus with 13 setae. (AR 1.13–1.34, Clypeus with 8, 10 setae in the original description). 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 2.7. Costa extension 50 µm long. Tentorium 185 µm long, 40 µm wide. Palpomeres length (in µm): –, –, 115, 145, 225. Palpomere 2 ellipsoid, 3 and 4 rectangular, 5 long and slender, Palpomeres 5/3: 2.0. Laterosternite IX with 5 long setae. Anal point sharp pointed and 55 µm long, basal wide 25 µm, peak wide 3 µm, with 4 long lateral setae on each side and 4 basal setae. Transverse sternapodeme 110 µm long, with oral projections. Gonocoxite 213 µm long. Gonostylus 105 µm long, with large triangularly rounded costa dorsalis. Megaseta 18 µm long. HR 2.0, HV 3.2. The wing and hypopygium of holotype are re-drawn as in Figs 10 A–C .

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

Figures

FIGURE 10 A – C. Rhecricotopus (Rheocricotopus) tatequintus Sasa, Male imago. A. Wing. B. Hypopygium, dorsal view. C. Hypopygium, ventral view.