Rheocricotopus (Rheocricotopus) inaxeyeus Sasa, Katami & 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 : 268-269

Rheocricotopus (Rheocricotopus) inaxeyeus Sasa, Katami & Suzuki

( Figs 7 A–B )

Rheocricotopus (Rheocricotopus) inaxeyeus Sasa, Katami & Suzuki, 2001: 19 ; Ashe & O’Connor 2012: 571.

Material examined. Holotype, male, on the shore of Lake Inawashiro, The Dr.Noguchi Memorial Hall, Japan. 5. VIII. 2000, light trap (No.401: 79).

Diagnostic characters. The species can be separated from other East Asian members of the genus by superior volsella developed and with rounded margin, inferior volsella a little hooked and like nose-shaped, with many setae; anal point with 2 long lateral setae on each side, transverse sternapodeme without oral projections.

Additional description and corrections. AR should be 0.50 (AR 0.96 in 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 2.2. Wing length / length of profemur 2.6. Tentorium 135 µm long, 23 µm wide. Dorsocentrals 11, scutellars 6. Squama with 6 setae. Palpomeres length (in µm): 35, 38, 78, 98, 148. Palpomere 2 ellipsoid, 3 and 4 rectangular, 5 long and slender, Palpomeres 5/3: 1.9. Laterosternite IX with 8 long setae. Anal point 25 µm long, basal wide 20 µm, peak wide 5 µm, with 2 long lateral setae on each side. Transverse sternapodeme 60 µm long, without oral projections. Gonocoxite 153 µm long. Gonostylus 65 µm long, with triangularly pointed costa dorsalis. Megaseta 13 µm long. HR 2.3, HV 3.8. The hypopygium of holotype are re-drawn as in Figs 7 A–B .

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

Figures

FIGURE 7 A – B. Rhecricotopus (Rheocricotopus) inaxeyeus Sasa, Kitami & Suzuki, Male imago. A. Hypopygium, dorsal view. B. Hypopygium, ventral view.