Nilothauma,

Qi, Xin, Lin, Xiaolong, Wang, Xinhua & Shao, Qingjun, 2014, A new species of Nilothauma Kieffer from China, with a key to known species of the genus (Diptera: Chironomidae), Zootaxa 3869 (5), pp. 573-578: 576-578

publication ID

http://dx.doi.org/10.11646/zootaxa.3869.5.7

publication LSID

lsid:zoobank.org:pub:1FE110B4-4BD3-47D0-941F-803851CEFC2B

persistent identifier

http://treatment.plazi.org/id/3A73FB03-FFE6-FFCB-FF7F-1A73FA41FD09

treatment provided by

Plazi

scientific name

Nilothauma
status

 

Key to males of the genus Nilothauma  in the world

[Data compiled from Adam & Saether (1999), Yan et al. (2005), Mendes & Andersen (2009) and this study.]

1. Tergite IX without dorsal projection....................................................................... 2

- Tergite IX with one or two dorsal projections................................................................ 8

2. Anal point absent...................................................................................... 3

- Anal point present. Brazil.............................................. N. aripuanense Mendes & Andersen, 2009 

3. Inferior volsella simple................................................................................. 4

- Inferior volsella with subapical branch. Brazil............................. N. complicatum Mendes & Andersen, 2009 

4. Superior volsella pediform or subquadrangular, without ventral transverse fold, with setae and microtrichia.............. 5

- Superior volsella diamond-shaped, with ventral transverse fold, with microtrichia only............................... 7

5. Superior volsella subquadrangular; median vosella distinct; AR> 1.00; abdomen with oral dark bands. Brazil............................................................................... N. longissimum Mendes & Andersen, 2009 

- Superior volsella pediform; median and superior volsellae fused; AR <0.40; abdomen without dark bands............... 6

6. R 1 with setae; gonostylus nearly parallel-sided in apical 1 / 2. Brazil, Ecuador................... N. fittkaui (Soponis, 1987) 

- R 1 bare; gonostylus widest in apical 1 / 3. Brazil........................................... N. reissi (Soponis, 1987) 

7. Apex of superior volsella projecting caudad. Brazil......................... N. sooretamense Mendes & Andersen, 2009 

- Apex of superior volsella projecting mesad. Brazil.......................... N. involucrum Mendes & Andersen, 2009 

8. Anal point lacking or rudimentary........................................................................ 9

- Anal point present.................................................................................... 13

9. Dorsal projections of tergite IX in different shapes. Ghana.......................... N. insolitum Adam & Saether, 1999 

- Dorsal projections of tergite IX in the same shape........................................................... 10

10. Median volsella fused with superior volsella; superior volsella broadly pediform. Brazil.................................................................................................. N. fazzariense Mendes & Andersen, 2009 

- Median volsella distinct and separated from superior volsella; superior volsella digitate, curved, with or without lateral spine.................................................................................................... 11

11. Dorsal projections of tergite IX overreaching posterior margin of tergite. Brazil....... N. roquei Mendes & Andersen, 2009 

- Dorsal projections of tergite IX not extended beyond posterior margin of tergite................................... 12

12. Superior volsella with lateral spine; laterosternite IX with thorn; inferior volsella with simple stout setae; posterior margin of tergite IX broadly rounded. Brazil............................................ N. calori Mendes & Andersen, 2009 

- Superior volsella without lateral spine; laterosternite IX without thorn; inferior volsella with some apically split setae; poste- rior margin of tergite IX subrectangular. Costa Rica.......................... .. N. strebulosum (Adam & Saether, 2000) 

13. Tergite IX with one dorsal projection..................................................................... 14

- Tergite IX with two dorsal projections.................................................................... 20

14. Superior volsella without microtrichia.................................................................... 15

- Superior volsella covered with microtrichia................................................................ 18

15. Dorsal projection weakly developed and undivided; situated posteriorly on tergite IX, close to base of anal point. China, Japan, Thailand...................................................................... N. japonicum Niitsuma, 1985 

- Dorsal projection well developed, divided or undivided, situated anteriorly on tergite IX, distant from base of anal point... 16

16. Dorsal projection 3 –pronged at apex, without setae. Ghana........................... N. fuscina Adam & Saether, 1999 

- Dorsal projection bell-shaped, with many setae.............................................................. 17

17. Superior volsella with single apical seta; anal point narrow. Brazil............ N. matogrossense Mendes & Andersen, 2009 

- Superior volsella with one dorsolateral and one apical spine-like seta; anal point broad. Ghana.................................................................................................. N. duminola Adam & Saether, 1999 

18 Anal point tapering or slightly widened medially but not spatulate; median volsella a digitiform process at least twice as long as wide with 3 or occasionally 2 apical setae. Nearctic.................................... N. babiyi (Rempel, 1937) 

- Anal point spatulate; median volsella consisting of 2 setae on separate or fused tubercles............................ 19

19. Dorsal projection small, with setae at apex only. Nearctic.......................... N. verrucum Adam & Saether, 1999 

- Dorsal projection extending over most of tergite IX. Australia...................... N. adunatum Adam & Saether, 1999 

20. Dorsal projections of tergite IX in the same shape........................................................... 21

- Dorsal projections of tergite IX in different shapes.......................................................... 24

21. Anal point short, digitiform, with microtrichia in basal 1 / 2; gonostylus distinctly widened in apical 1 / 3. Brazil...................................................................................... N. zitoi Mendes & Andersen, 2009 

- Anal point well developed, lanceolate or parallel-sided; gonostylus nearly parallel-sided in apical 1 / 2 ................. 22

22. Anal point parallel-sided; laterosternite IX with thorn. Chile........................ N. spiesi Mendes & Andersen, 2009 

- Anal point lanceolate; laterosternite IX without thorn........................................................ 23

23. Inferior volsella and gonostylus with apically split setae; median volsella curved, tapering, with microtrichia and setae. Brazil................................................................... N. jaraguaense Mendes & Andersen, 2009 

- Inferior volsella and gonostylus with simple setae only; median volsella short, parallel-sided, with 2 apical setae, without microtrichia. Brazil................................................... N. amazonense Mendes & Andersen, 2009 

24. Wing with dark areas or bands; anterior tergite IX projection long and deeply divided.............................. 25

- Wing without dark markings; anterior tergite IX projection variably developed.................................... 32

25. Anterior tergite IX projection with setae not concentrated around apex. South Africa...... N. harrisoni Adam & Saether, 1999 

- Anterior tergite IX projection with apical setae only......................................................... 26

26. Posterior tergite IX projection deeply divided into antero-dorsal and postero-ventral parts........................... 27

- Posterior tergite IX projection not as above................................................................ 29

27. Anterior tergite IX projection with apical setae simple, separate; anterior part of posterior projection apically pointed; postero- median wing spot extends on both sides of Cu 1. Afrotropical.............................. N. pictipenne Kieffer, 1921 

- Anterior tergite IX projection with setae forming fan-like structures; anterior part of posterior projection with blunt apex; pos- tero-median wing spot exclusively proximal of Cu 1 .......................................................... 28

28. Wing with 4 dark areas; setae of anterior tergite IX projection branched at tip. Ghana... N. flabellatum Adam & Saether, 1999 

- Wing with 3 dark areas; apical setae of anterior tergite IX projection not branched, lamellar. Ghana............................................................................................ N. kakumense Adam & Saether, 1999 

29. Posterior tergite IX projection either with a disto-dorsal lobe or subapical constriction.............................. 30

- Posterior tergite IX projection without an distal lobe or constriction............................................. 31

30. Posterior tergite IX projection with long antero-lateral arms and a disto-dorsal lobe. Tanzania.................................................................................................. N. anderseni Adam & Saether, 1999 

- Posterior tergite IX projection without antero-lateral arms, with apical constriction and 5 apical setae. Zimbabwe................................................................................ N. latocaudatum Adam & Saether, 1999 

31. Posterior tergite IX projection without microtrichia except on long antero-lateral arms; superior volsella without antero-median extension; median volsella present. China, Japan..................................... N. nojirimaculatum Sasa, 1991 

- Posterior tergite IX projection without anterolateral arms, covered with microtrichia; superior volsella with an antero-median extension; median volsella apparently absent. Japan................................... N. hibaraquartum Sasa, 1993 

32. Anterior tergite IX projection with apically plumose setae; anal point broadly lanceolate............................ 33

- Apical setae of anterior tergite IX projection not plumose; anal point not broadly lanceolate, but sometimes spatulate..... 39

33. Anterior tergite IX projection completely divided, broader than long............................................ 34

- Anterior tergite IX projection at most partly divided, longer than broad.......................................... 36

34. Superior volsella slender, without microtrichia. Nearctic.................................. N. mirabile (Townes, 1945) 

- Superior volsella pad-like, covered with microtrichia........................................................ 35

35. Presence of microtrichia on the anal point; median volsella curved, rounded at apex, with 2 long basal setae and 1 long median seta. Oriental China........................................................................ N. pandum  sp.n.

- Absence of microtrichia on the anal point; median volsella bifid, each branch with one apical seta, one branch with one addi- tional lateral seta. Japan, Europe................................................... .. N. hibaratertium Sasa, 1993 

36. Superior volsella simple, covered with microtrichia. Japan............................. N. sasai Adam & Saether, 1999 

- Superior volsella bifid or trifid, microtrichiose areas at most of limited extent..................................... 37

37. Superior volsella bifid, both branches with at least one terminal seta; anterior tergite IX projection with 11–14 setae. Thailand.......................................................................... N. mergae Adam & Saether, 1999 

- One lateral branch of superior volsella sharply pointed without an apical seta; anterior tergite IX ptojection with about 15 or about 33 setae....................................................................................... 38

38. Anterior tergite IX projection with about 33 setae; superior volsella apically narrow and parallel-sided with 1–2 apical setae. Oriental China................................................................. N. acre Adam & Saether, 1999 

- Anterior tergite IX projection with about 15 setae; superior volsella broadened apically with one long laterally directed seta and 8–10 short setae. Nearctic....................................................... N. bicorne (Townes, 1945) 

39. Anal point trifid; anterior tergite IX projection very long, tapering to patallel-sided apex, with setae only apically; posterior tergite IX projection distally very slender, with 5 apical setae. D. R. Congo, Ghana N. burmeisteri Adam & Saether, 1999 

- Anal point simple; anterior tergite IX projection wart-like, with setae not concentrated around apex; posterior tergite IX projec- tion triangular or apically rounded....................................................................... 40

40. Posterior tergite IX projection apically rounded; superior volsella with four lobes. Oriental China........................................................................................... N. quatuorlobum Yan, Tang & Wang, 2005 

- Posterior tergite IX projection triangular; superior volsella without lobe.......................................... 41

41. Anal point patallel-sided; anterior tergite IX projection with setae thickened at apices. Ghana.................................................................................................. N. ankasense Adam & Saether, 1999 

- Anal point spatulate; anterior tergite IX projection with setae not thickened at apices............................... 42

42. Superior volsella tapering, widest near base. Europe................................... N. brayi (Goetghebuer, 1921) 

- Superior volsella narrowest at base, widest about 1 / 3 from apex. Australia............. N. infissum Adam & Saether, 1999