Rheotanytarsus pellucidus (Walker, 1848)

Liu, Wen-Bin, Yao, Yuan, Chang, Tong, Yan, Chun-Cai & Lin, Xiao-Long, 2022, Contribution to the knowledge of Rheotanytarsus pellucidus species group from China (Diptera, Chironomidae): three new and one newly recorded species, Zootaxa 5188 (2), pp. 145-156 : 155

Key to known adult males of the Rheotanytarsus pellucidus species group

(Based on the key in Kyerematen et al. 2000)

1. Median volsella relatively short, not reaching apex of inferior volsella........................................... 2

- Median volsella very long, extending beyond apex of inferior volsella........................................... 3

2. Inferior volsella curved and sharply pointed at apex; superior volsella widest at apex; median volsella with wide, nearly circular apical plate; Australia................................................... Rheotanytarsus flabellatus Glover, 1973

- Inferior volsella not apically pointed, superior volsella elongated with bluntly rounded apex; median volsella with relatively narrow, ovoid apical plate; Thailand................................. Rheotanytarsus thailandensis Moubayed, 1990

3. Median volsella with distal setae fused into narrow plate with or without apical points; Japan........................................................................................ Rheotanytarsus yufualbus Sasa & Suzuki, 1991

-. Median volsella with lamelliform setae, but never fused into plate............................................... 4

4. AR relatively large and about 0.75; superior volsella with microtrichia; Europe, north Africa, Canada, America, Mongolia..................................................................... Rheotanytarsus pellucidus ( Walker, 1848)

- AR relatively small and less than 0.60; superior volsella without microtrichia...................................... 5

5. Superior volsella with knob-like structure; stem of median volsella apically broader................................ 6

- Superior volsella without knob-like structure; stem of median volsella tapered or with equal width..................... 7

6. Gonostylus curved apically; anal crest nearly parallel-sided; tergite IX triangular... Rheotanytarsus pinderi Yao & Liu sp. n.

- Gonostylus not curved apically; anal crest of V-type; tergite IX with rounded margin; Australia, China, Thailand................................................................................... Rheotanytarsus oss Cranston, 1997

7. Anal crest basally fused to form an arc.................................... Rheotanytarsus tamasecundus Sasa, 1980

- Anal crest basally not fused............................................................................. 8

8. Anal point very thin apically; anal crest reduced and not visible; China........ Rheotanytarsus apiculus Wang & Guo, 2004

- Anal point not thin apically; anal crest visible and evenly developed............................................. 9

9. Inferior volsella without microtrichia; cell m with about 20 setae; Ghana, China.................................................................................................. Rheotanytarsus buculicaudus Kyerematen, 2000

- Inferior volsella with microtrichia; setae number of cell m less than 5........................................... 10

10. Thorax pale or pale brown without spots; Thailand.......................................................... 11

- Thorax pale yellow with dark brown spots and postnotum dark brown; China..................................... 12

11. Anal tergal bands nearly horizontal; 13th flagellomere of antenna extremely short, AR only 0.06...................................................................................... Rheotanytarsus minusculus Kyerematen, 2000

- Anal tergal bands of V-type; 13th flagellomere of antenna relatively long, AR 0.39–0.48........................................................................................ Rheotanytarsus contrerasi Andersen & Saether, 2000

12. Anal tergal bands fused; stem of median volsella with foliate setae basally; gonostylus with rounded apex................................................................................ Rheotanytarsus vallenduuki Yao & Liu sp. n.

- Anal tergal bands separated; stem of median volsella without foliate setae; gonostylus with pointed apex...................................................................................... Rheotanytarsus ashei Yao & Liu sp. n.