Rheotanytarsus

Wang, Xinhua & Guo, Yuhong, 2004, A review of the genus Rheotanytarsus Thienemann & Bause from China (Diptera: Chironomidae: Tanytarsini), Zootaxa 650, pp. 1-19 : 16-17

Key to males of Rheotanytarsus of China

1. Antenna with 12 flagellomeres .................................................................................... 2

­ Antenna with 13 flagellomeres .................................................................................... 3

2. Apical lamellae of median volsella bulbous ( Fig. 5 ) ............................. R. bullus sp. n.

­ Apical lamellae of median volsella not bulbous ( Fig. 7 ) ............... R. polychaetus sp. n.

3. Apex of anal point pointed; tergite IX bare ( Fig. 13 ) ........................... R. apiculus sp. n.

­ Apex of anal point spatulate, as wide as its basal width, or at least rounded................ 4

4. Abdomen banded. Posterior margin of tergite IX lateral to anal point straight ( Fig. 9 ). ................................................................................................................... R. liuae sp. n.

­ Abdomen evenly coloured. Posterior margin of tergite IX forming a triangular base for the anal point ................................................................................................................ 5

5. Median volsella long, reaching beyond apex of inferior volsella (Kyerematen & Saether 2000: Figs. 43–46) ................................ R. buculicaudus Kyerematen & Saether

­ Median volsella short, not reaching beyond apex of inferior volsella ......................... 6

6. Base of anal point with a tuft of setae ( Fig. 15 ) ..................................... R. fundus sp. n.

­ Base of anal point without setal cluster ........................................................................ 7

7. Gonostylus tapering gradually to rounded apex ........................................................... 8

­ Gonostylus abruptly tapered in apical portion and with narrow apex ........................ 10

8. Superior volsella subtriangular ( Fig. 18 )....................................... R. brevipalpus sp. n.

­ Superior volsella oblong .............................................................................................. 9

9. Lamellae of median volsella fused into plate, anal point without anal crests ( Sasa 1980: Fig. 11 ; Wang & Zheng 1993: Figs. 1–2 ; Kyerematen, Andersen & Saether 2000: Figs. 3 A–D) .......................................................................... R. tamaquartus Sasa

­ Lamellae of median volsella not fused into plate, anal point with well developed crests ( Tokunaga 1938: Fig. 31; Chaudhuri et al 1994: Figs. 2–3 ; Kyerematen, Andersen & Saether 2000: Figs. 1 A–D; Sasa & Kikuchi 1986: Fig. 3 J; Wang & Zheng 1993: Fig. 4 ) ................................................................................................. R. aestuarius (Tokunaga)

10. Gonostylus recurved at apex ...................................................................................... 11

­ Gonostylus not recurved at apex ................................................................................ 12

11. Superior volsella with bluntly rounded apical projection ( Johannsen 1932: Fig. 37; Chaudhuri, Datta & Mazumdar 1994: Fig. 1 ; Kyerematen, Andersen & Saether 2000: Figs. 2 D–G; Wang & Zheng 1993: Figs. 5–6 ) .......................... R. acerbus (Johannsen)

­ Superior volsella rounded ( Fig. 2 ) ......................................................... R. aphelus sp. n.

12. Superior volsella rectangular. Median volsella with almost all lamellae fused into plate ( Fig. 11 ) .................................................................................... R. quadratus sp. n.

­ Superior volsella subtriangular or bean­shaped. Median volsella with apical foliate

setae fused into plate and markedly recurved with sickle­shaped apex ..................... 13 13. Superior volsella with posterior margin produced giving a hook­like projection ( Lehman 1970: Figs. 11–13 ; Albu 1980: Fig. 191; Wang and Zheng 1993: Fig. 3 ) .............. .............................................................................................. R. muscicola Thienemann ­ Superior volsella rectangular and with rounded margin ............................................ 14

14. Anal point spatulate ( Sasa 1980: Fig. 8 ) .......................................... R. tamatertius Sasa

­ Anal point narrow at apex ( Tokunaga 1938: Fig. 29; Lehmann 1970: Figs. 9–10 ) ....... ................................................................................................... R. pentapodus (Kieffer)

Figures

FIGURES 1 – 5. Figs. 1 – 3. Rheotanytarsus aphelus sp. n. Holotype, male imago: 1. Wing, 2. Hypopygium, 3. Median volsella. Figs. 4 – 5. Rheotanytarsus bullus sp. n. Holotype, male imago: 4. Wing, 5. Hypopygium

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

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

FIGURES 14 – 18. Figs. 14 – 16. Rheotanytarsus fundus sp. n. Holotype, male imago: 14. Wing, 15. Hypopygium, 16. Median volsella. Figs. 17 – 18. Rheotanytarsus brevipalpus sp. n. Holotype, male imago: 17. Wing, 18. Hypopygium