Rheocricotopus Brundin

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 : 275

Key to of 13 males of Rheocricotopus Brundin from the Sino–Indian Region

1. Tergite IX reduced, the posterior margin of tergite IX almost coincide with the base of anal point...................... 2

- Tergite IX developed, the posterior margin of tergite IX exceed the apex of anal point............................... 6

2. Superior volsella triangular or rounded or absent, relatively small............................................... 3

– Superior volsella longitypical or tooth–like, relatively large.................................................... 5

3. Inferior volsella triangular and hooked........................................... R. (P.) isigadeeus Sasa & Suzuki

- Inferior volsella rounded................................................................................ 4

4. Anal point with 2 lateral setae on each side, inferior volsella double–layered.......................................................................................................................... R. (P.) kurocedeus Sasa

- Anal point with without lateral setae on each side, inferior volsella single–layered........................................................................................................ R. (P.) tobatervicesimus Kikuchi & Sasa

5. Superior volsella longitypical, inferior volsella pointed triangular........................... R. (R.) tamahumeralis Sasa

- Superior volsella tooth–like, inferior volsella rounded.................................... R. (R.) tedorisecundus Sasa

6. Gonostylus with apical pointed triangular crista dorsalis....................................................... 7

- Gonostylus with preapical or middle rounded triangular crista dorsalis or without................................... 8

7. Anal point with 2 lateral setae on each side, inferior volsella rounded, double–layered.... R. (P.) hidakadeeus Sasa & Suzuki

- Anal point with with 5 lateral setae on each side, inferior volsella slightly hooked, single–layered................................................................................................ R. (P.) tokarakeleus Sasa & Suzuki

8. Gonostylus without crista dorsalis.......................................... R. (R.) togapeniculus Sasa & Okazawa

- Gonostylus with crista dorsalis........................................................................... 9

9. Superior volsella with almost right–angle corner............................................................ 10

- Superior volsella with rounded corner or tooth–like or absent.................................................. 11

10. Transverse sternapodeme without oral projections, inferior vosella single–layered.. R. (R.) inaxeyeus Sasa, Kitami & Suzuki

- Transverse sternapodeme with oral projections, inferior vosella double–layered... R. (R.) inaquereus Sasa, Kitami & Suzuki

11. Superior volsella tooth–shaped......................................................... R. (R.) tatequintus Sasa

- Superior volsella rounded or absent...................................................................... 12

12. Inferior volsella foot–shaped, gonostylus with preapical crista dorsalis................... R. (R.) shoufukusecundus Sasa

- Inferior volsella rounded with a small lobe, gonostylus with middle crista dorsalis....... R. (R.) yakulemeus Sasa & Suzuki