Rheotanytarsus apiculus, Wang, Xinhua & Guo, Yuhong, 2004

Wang, Xinhua & Guo, Yuhong, 2004, A review of the genus Rheotanytarsus Thienemann & Bause from China (Diptera: Chironomidae: Tanytarsini), Zootaxa 650, pp. 1-19 : 11-12

Rheotanytarsus apiculus sp. n. ( Figs. 12–13 )

Type material. Holotype male (BDN No. 07458), China, Yunnan Province, Jinghong Country. IV. 3. 1987. Leg. H. Zou, sweep net.

Etymology. From Latin apiculus , point, referring to the spiny anal point, which is unique within the genus.

Diagnosis. The species differs from other members of the pellucidus group by the long and narrow anal point without crests.

Male imago (n=1).

Total length 1.02 mm. Wing length 0.72 mm. Total length / wing length 1.42. Wing length / profemur length 2.06. Ground coloration yellowish, scutum and vittae slightly brown, femur and tibia of foreleg brown in apical 1/5, femur of middle and hind legs brown in apical 1/5, eyes black.

Head. Antenna with 13 flagellomeres. Ultimate flagellomere 84 µm long. AR 0.24. Temporal setae consisting of 1 inner and 2 outer verticals. Clypeus with 15 setae. Tentorium 54 µm long, width 7 µm. Palpomere lengths (in µm): 20; 15; 20; 42; 60.

Wing ( Fig. 12 ). VR 1.46, Cu length 336 µm.

Thorax. Acrostichals 2; dorsocentrals 6; prealars 1. Scutellum with 2 setae.

Legs. Spur of front tibia 19 µm. Spurs of middle tibia 22 and 12 µm long, of hind tibia 20 and 22 µm long. Combs of middle leg composed of 8 and 8 free teeth, hind composed of 11 and 6 free teeth (Table 6):

Hypopygium ( Fig. 13 ). Tergite IX without setae. Anal point 26 µm long, and distally very thin, without crests. Phallapodeme 30 µm long. Transverse sternapodeme 26 µm long, straight, with oral projections. Gonocoxite 64 µm long. Superior volsella 20 µm long, subrectangular, with 1 inner and 3 outer margin setae. Inferior volsella 40 µm long. Median volsella 74 µm long, lamellae not fused into plate, extending to apex of gonostylus. Gonostylus tapering gradually to rounded apex, 44 µm long. HR 1.45; HV 2.32.

Distribution. The present species is known from Yunnan Province of southern China (Oriental Region).

Figures

FIGURES 10 – 13. Figs. 10 – 11. Rheotanytarsus quadratus sp. n. Holotype, male imago: 10. Wing, 11. Hypopygium. Figs. 12 – 13. Rheotanytarsus apiculus sp. n. Holotype, male imago: 12. Wing, 13. Hypopygium