Published February 16, 2016 | Version v1
Taxonomic treatment Open

Nilothauma Kieffer 1921

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

Notes

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

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Linked records

Additional details

Biodiversity

Family
Chironomidae
Genus
Nilothauma
Kingdom
Animalia
Order
Diptera
Phylum
Arthropoda
Scientific name authorship
Kieffer
Taxon rank
genus
Taxonomic concept label
Nilothauma Kieffer, 1921 sec. Niitsuma, 2016

References

  • Niitsuma, H. (1985) A new species of the genus Nilothauma (Diptera, Chironomidae) from Japan. Kontyu, 53, 229 - 232.
  • Adam, J. I. & Saether, O. A. (1999) Revision of the genus Nilothauma Kieffer, 1921 (Diptera: Chironomidae). Entomologica scandinavica, 56 (Supplement), 1 - 107.
  • Kieffer, J. J. (1921) Synopse de la tribu des Chironomariae (Dipteres). Annales de la Societe scientifique de Bruxelles, 40, 269 - 277.
  • Sasa, M. (1993) Studies on the chironomid midges (yusurika) collected in Toyama and other areas of Japan, 1993. Part 5. The chironomids collected from lakes in the Aizu district (Fukushima). Research Report from Toyama Prefectural environmental Pollution Research Centre, 1993, 69 - 95.
  • Qi, X., Lin, X., Wang, X. & Shao, Q. (2014) A new species of Nilothauma Kieffer from China, with a key to known species of the genus (Diptera: Chironomidae). Zootaxa, 3869 (5), 573 - 578. http: // dx. doi. org / 10.11646 / zootaxa. 3869.5.7
  • Townes, H. K. (1945) The Nearctic species of Tendipedini [Diptera, Tendipedidae (= Chironomidae)]. The American Midland Naturalist, 34, 1 - 206.