Nilothauma Kieffer 1921
Creators: name: Niitsuma, Hiromi
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Chironomidae
Nilothauma

description: Key to male imagines of the genus Nilothauma Kieffer
[Neotropical species not included]
1. Tergite IX with one dorsal projection...................................................................... 2
- Tergite IX with 2 dorsal projections...................................................................... 7
2. Dorsal projection weakly developed, situated posteriorly on tergite IX, close to base of anal point; Palaearctic Japan, Oriental China, Thailand ............................................................... N. japonicum Niitsuma, 1985
- Dorsal projection well developed, situated anteriorly on tergite IX, distant from base of anal point.................... 3
3. Superior volsella very slender, without microtrichia, with 2–3 spine-like setae..................................... 4
- Superior volsella at least as thick as inferior volsella, extensively covered with microtrichia, with 3–5 long and some short setae............................................................................................... 5
4. Dorsal T IX projection bell-shaped, with setae thickened at apices; anal point broad; superior volsella with 2 spine-like setae; Ghana ................................................................... N. duminola Adam & Saether, 1999
- Dorsal T IX projection long, without setae, and 3-pronged at apex; anal point narrow; superior volsella with 3 spine-like setae; Ghana .................................................................... N. fuscina Adam & Saether, 1999
5. Anal point tapering or slightly widened medially but not spatulate; median volsella digitiform, at least twice as long as wide with 3 or occasionally 2 apical setae; Canada, USA ...................................... N. babiyi (Rempel, 1937)
- Anal point spatulate; median volsella consisting of 2 setae on separate or fused tubercles............................ 6
6. Dorsal T IX projection small, with setae at apex only; Canada ...................... N. verrucum Adam & Saether, 1999
- Dorsal T IX projection extending over most of tergite IX; Australia ................. N. adunatum Adam & Saether, 1999
7. Wing with dark areas or bands; anterior T IX projection long and deeply divided...................................8
- Wing without dark markings; anterior T IX projection variably developed...................................... 16
8. Anterior T IX projection with setae not concentrated around apex............................................... 9
- Anterior T IX projection with apical setae only............................................................. 10
9. Eye hairy, at least among marginal ommatidia; wing with 5 dark spots; anal point present; South Africa........................................................................................... N. harrisoni Adam & Saether, 1999
- Eye bare, wing with 2 dark bands; anal point absent; Ghana......................... N. insolitum Adam & Saether, 1999
10. Posterior T IX projection deeply divided into antero-dorsal and postero-ventral parts.............................. 11
- Posterior T IX projection not as above................................................................... 13
11. Anterior T IX projection with apical setae simple, separate; anterior part of posterior projection apically pointed; postero- median wing spot extends on both sides of Cu1; Sudan, Chad, Guinea, Ivory Coast, Nigeria, Senegal, Togo .............................................................................................. N. pictipenne Kieffer, 1921
- Anterior T IX projection with setae forming fan-like structures; anterior part of posterior projection with blunt apex; postero- median wing spot exclusively proximal of Cu1.............................................................. 12
12. Wing with 4 dark areas; setae of anterior T IX projection branched at tip; Ghana...... N. flabellatum Adam & Saether, 1999
- Wing with 3 dark areas; apical setae of anterior T IX projection not branched, lamellar; Ghana ................................................................................................ N. kakumense Adam & Saether, 1999
13. Posterior T IX projection either with a disto-dorsal lobe or subapical constriction................................ 14
- Posterior T IX projection without a distal lobe or construction................................................ 15
14. Posterior T IX projection with long antero-lateral arms and a disto-dorsal lobe; Tanzania ..................................................................................................... N. anderseni Adam & Saether, 1999
- Posterior T IX projection without antero-lateral arms, with subapical constriction and apical setae; Zimbabwe .................................................................................. N. latocaudatum Adam & Saether, 1999
15. Posterior T IX projection without microtrichia except on long antero-lateral arms; superior volsella without antero-median extension; median volsella present; Palaearctic Japan, Oriental China .................... N. nojirimaculatum Sasa, 1991
- Posterior T IX projection without antero-lateral arms, covered with microtrichia; superior volsella with an antero-median extension; median volsella apparently absent; Palaearctic Japan ......................... N. hibaraquartum Sasa, 1993
16. Apical setae of anterior T IX projection plumose............................................................ 17
- Apical setae of anterior T IX projection not plumose....................................................... 23
17. Anal point with microtrichia along median ridge and apical margin; Oriental China .. N. pandum Qi, Lin, Wang & Shao, 2014
- Anal point without microtrichia......................................................................... 18
18. Superior volsella pad-like, with microtrichia extensively; Palaearctic Japan.................. N. hibaratertium Sasa, 1993
- Superior volsella slender, microtrichia absent or limited within small area when present............................ 19
19. Superior volsella without lateral spur; Thailand................................... N. mergae Adam & Saether, 1999
- Superior volsella with lateral spur........................................................................ 20
20. Superior volsella without setal brush or fringe; Oriental China ........................... N. acre Adam & Saether, 1999
- Superior volsella with apical setal brush or fringe.......................................................... 21
21. Superior volsella 4–5 times as long as median volsella; Palaearctic Japan.......................... N. niidaensis n. sp.
- Superior volsella 2–3 times as long as median volsella....................................................... 22
22. Anterior T IX projection 2–4 times as long as broad; Canada, USA ......................... N. bicorne (Townes, 1945)
- Anterior T IX projection broader than long; USA ...................................... N. mirabile (Townes, 1945)
23. Superior volsella pad-like, with microtrichia extensively..................................................... 24
- Superior volsella slender, microtrichia absent or limited within small area when present............................ 25
24. 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
25. Anal point trifid; anterior T IX projection very long, tapering to parallel-sided apex, with setae only apically; posterior projec- tion distally very slender, with apical setae; Ghana, D. R. Congo................... N. burmeisteri Adam & Saether, 1999
- Anal point simple; anterior T IX projection wart-like, with setae not concentrated around apex; posterior projection triangular or bell-shaped....................................................................................... 26
26. Anal point parallel-sided; anterior T IX projection with setae thickened at apices; Ghana ...................................................................................................... N. ankasense Adam & Saether, 1999
- Anal point spatulate; anterior T IX projection with setae not thickened at apices; Oriental China .......................................................................................... N. quatuorlobum Yan, Tang & Wang, 2005
description: Published as part of Niitsuma, Hiromi, 2016, Two species of Nilothauma Kieffer (Diptera, Chironomidae) from Japan, with description of a new species, pp. 573-581 in Zootaxa 4079 (5) on pages 579-580, DOI: 10.11646/zootaxa.4079.5.4, http://zenodo.org/record/1050881