Rheotanytarsus liuae, 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 : 8

Rheotanytarsus liuae sp. n. ( Figs. 8–9 )

Type material Holotype male (BDN No. 20408), China, Fujian Province, Yongtai County, 17. IX. 2002. Leg. Zh Liu, light trapped.

Etymology. Named in honour of Ms. Zh. Liu who collected the type material.

Diagnosis. The species is characterized by the straight shoulders on tergite IX adjacent to the anal point base and the lack of plates on the median volsellae, a combination found only in R. tobaseptidecimus Kikuchi & Sasa of the globosus group. It differs from R. tobasepticecimus by having an H­shaped tergite band, where they are of the Y type in R. tobaseptidecimus .

Male imago (n=1)

Total length 2.10 mm. Wing length 1.14 mm. Total length / wing length 1.84. Wing length / length of profemur 1.74. Ground coloration pale, thorax with brown vittae, legs yellowish with apical 1/5 of femur brown and abdomen with brown metanotum.

Head. Antenna with 13 flagellomeres. AR 0.75, ultimate flagellomere 328 µm long. Temporal setae 9, including 5 inner verticals, 3 outer verticals and 1 postorbital. Clypeus with 16 setae. Tentorium 100 µm long, 25 µm wide. Palpomere lengths (in µm): 30; 30; 86; 94; 154.

Thorax. Acrostichals 11; dorsocentrals 8; prealars 1; scutellars 4.

Wing ( Fig. 8 ). RM with 1 setae. VR 1.50, Cu length 560 µm.

Legs. Coloration yellowish and femur with brown apex. Front tibia spur 22 µm. Spur of middle tibia 28 and 28 µm and hind tibia 34 and 32 µm long. The combs of middle leg composed of 12 and 11 free teeth, hind leg of 16 and 12 free teeth ( Table 4):

fe ti ta1 ta2 ta3 ta4 ta5 LR P1 656 340 660 360 280 200 88 1.94 P2 620 450 250 136 100 70 50 0.56 P3 690 576 376 230 184 120 70 0.65

Hypopygium ( Fig. 9 ). Anal tergite bands of H type. Posterior margin of tergite IX lateral of anal point straight and tergite IX with 7 dorsal setae. Anal point 27 µm long, parallel­sided and slightly dilated apically. Crests well developed, basally rounded and fused near apex, no setae between or basal to crests. Phallapodeme 70 µm long. Transverse sternapodeme 50 µm long. Gonocoxite 100 µm long. Superior volsella 36 µm long, elongate ovoid. Inferior volsella 64 µm long. Median volsella 50 µm long, with distal setae not fused into plates. Gonostylus 90 µm long. HR 1.11; HV 2.33.

Distribution. The species is known from Fujian Province (Oriental China).

Figures

FIGURES 6 – 9. Figs. 6 – 7. Rheotanytarsus polychaetus sp. n. Holotype, male imago: 6. Wing, 7. Hypopygium. Figs. 8 – 9. Rheotanytarsus liuae sp. n. Holotype, male imago: 8. Wing, 9. Hypopygium