Nilothauma Kieffer

Mendes, Humberto Fonseca & Andersen, Trond, 2009, Neotropical Nilothauma Kieffer, 1921, with the description of thirteen new species (Diptera: Chironomidae), Zootaxa 2063, pp. 1-45 : 12-13

Key to the males of Neotropical Nilothauma Kieffer

1. Tergite IX without setose dorsal lobe(s) ....................................................................................................................... 2

- Tergite IX with one or two setose dorsal lobes............................................................................................................. 8

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

- Anal point present ( Figs 9–12 ). Brazil.......................................................................... Nilothauma aripuanense sp. n.

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

- Inferior volsella with subapical branch ( Figs 20–23 ). Brazil. ..................................... Nilothauma complicatum sp. n.

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

- Superior volsella subquadrangular; median volsella distinct; AR> 1.00; abdomen with oral dark bands ( Figs 37–40 ). Brazil............................................................................................................... Nilothauma longissimum sp. n.

6. Wing vein R1 with setae; gonostylus nearly parallel-sided in apical 1/2 ( Figs 27–29 ). Brazil, Ecuador. ..................... ......................................................................................................................... Nilothauma fittkaui (Soponis) comb. n.

- Wing vein R1 bare; gonostylus widest in apical 1/3 ( Figs 49–51 ). Brazil. ......... Nilothauma reissi (Soponis) comb. n.

7. Apex of superior volsella projecting caudad ( Figs 55–57 ). Brazil. ............................ Nilothauma sooretamense sp. n.

- Apex of superior volsella projecting mesad ( Figs 30–32 ). Brazil. ................................. Nilothauma involucrum sp. n.

8. Anal point lacking or rudimentary and completely covered by microtrichia. ............................................................. 9

- Anal point present, with microtrichia at most in basal 1/2. ........................................................................................ 12

9. Median volsella distinct and separated from superior volsella; superior volsella digitate, curved, with or without lat- eral spine. .................................................................................................................................................................... 10

- Median volsella fused with superior volsella; superior volsella broadly pediform ( Figs 24–26 ). Brazil. ..................... ........................................................................................................................................ Nilothauma fazzariense sp. n.

10. Dorsal lobes of tergite IX not extended beyond posterior margin of tergite .............................................................. 11

- Dorsal lobes of tergite IX overreaching posterior margin of tergite ( Figs 52–54 ). Brazil. ... Nilothauma roquei sp. n.

11. Superior volsella with lateral spine; laterosternite IX with thorn; inferior volsella with simple stout setae; posterior margin of tergite IX broadly rounded ( Figs 17–19 ). Brazil. ................................................... Nilothauma calori sp. n.

- Superior volsella without lateral spine; laterosternite IX without thorn; inferior volsella with some apically split setae; posterior margin of tergite IX subrectangular ( Figs 61–63 ). Costa Rica.............................................................. .................................................................................................... Nilothauma strebulosum (Adam et Saether) comb. n.

12. Tergite IX with two setose dorsal lobes...................................................................................................................... 13

- Tergite IX with single median setose dorsal lobe ( Figs 41–44 ). Brazil. .................... Nilothauma matogrossense sp. n.

13. Anal point well developed, lanceolate or parallel-sided; gonostylus nearly parallel-sided in apical 1/2. ................. 14

- Anal point short, digitiform, with microtrichia in basal 1/2; gonostylus distinctly widened in apical 1/3 ( Figs 64–74 ). Brazil.......................................................................................................................................... Nilothauma zitoi sp. n.

14. Anal point lanceolate; laterosternite IX without thorn ............................................................................................... 15

- Anal point parallel-sided; laterosternite IX with thorn ( Figs 58–60 ). Chile............................ Nilothauma spiesi sp. n.

15. Inferior volsella and gonostylus with apically split setae; median volsella curved, tapering, with microtrichia and setae ( Figs 33–36 ). Brazil............................................................................................. Nilothauma jaraguaense sp. n.

- Inferior volsella and gonostylus with simple setae only; median volsella short, parallel-sided, with 2 apical setae, without microtrichia ( Figs 6–8 ). Brazil. ........................................................................ Nilothauma amazonense sp. n.

Figures

FIGURES 9 – 12. Nilothauma aripuanense sp. n., male. 9 — dorsal aspect of hypopygium. 10 — hypopygium with tergite IX and anal point removed, dorsal view left, ventral view right. 11 — superior volsella, dorsal view. 12 — median volsella, dorsal view.

FIGURES 20 – 23. Nilothauma complicatum sp. n., male. 20 — dorsal aspect of hypopygium. 21 — hypopygium with tergite IX and anal point removed, dorsal view left, ventral view right. 22 — inferior volsella, dorsal view. 23 — superior volsella, dorsal view.

FIGURES 37 – 40. Nilothauma longissimum sp. n., male. 37 — dorsal aspect of hypopygium. 38 — hypopygium with tergite IX and anal point removed, dorsal view left, ventral view right. 39 — superior volsella, dorsal view. 40 — median volsella, dorsal view.

FIGURES 27 – 29. Nilothauma fittkaui (Soponis) comb. n., male. 27 — dorsal aspect of hypopygium. 28 — hypopygium with tergite IX and anal point removed, dorsal view left, ventral view right. 29 — superior volsella, dorsal view.

FIGURES 49 – 51. Nilothauma reissi (Soponis) comb. n., male. 49 — dorsal aspect of hypopygium. 50 — hypopygium with tergite IX and anal point removed, dorsal view left, ventral view right. 51 — superior volsella, dorsal view.

FIGURES 55 – 57. Nilothauma sooretamense sp. n., male. 55 — dorsal aspect of hypopygium. 56 — hypopygium with tergite IX and anal point removed, dorsal view left, ventral view right. 57 — superior volsella, dorsal view.

FIGURES 30 – 32. Nilothauma involucrum sp. n., male. 30 — dorsal aspect of hypopygium. 31 — hypopygium, ventral view. 32 — superior volsella, ventral view.

FIGURES 24 – 26. Nilothauma fazzariense sp. n., male. 24 — dorsal aspect of hypopygium. 25 — hypopygium with tergite IX and anal point removed, dorsal view left, ventral view right. 26 — median and superior volsella, dorsal view.

FIGURES 52 – 54. Nilothauma roquei sp. n., male. 52 — dorsal aspect of hypopygium. 53 — hypopygium with tergite IX and anal point removed, dorsal view left, ventral view right. 54 — median and superior volsella, dorsal view.

FIGURES 17 – 19. Nilothauma calori sp. n., male. 17 — dorsal aspect of hypopygium. 18 — hypopygium with tergite IX and anal point removed, dorsal view left, ventral view right. 19 — median and superior volsella, dorsal view.

FIGURES 61 – 63. Nilothauma strebulosum (Adam et Saether) comb. n., male. 61 — dorsal aspect of hypopygium. 62 — hypopygium with tergite IX and anal point removed, dorsal view left, ventral view right. 63 — median and superior volsella, dorsal view.

FIGURES 41 – 44. Nilothauma matogrossense sp. n., male. 41 — dorsal aspect of hypopygium. 42 — hypopygium with tergite IX and anal point removed, dorsal view left, ventral view right. 43 — superior volsella, dorsal view. 44 — median volsella, dorsal view.

FIGURES 64 – 70. Nilothauma zitoi sp. n., male. 64 — head. 65 — cibarial pump, tentorium and stipes. 66 — thorax. 67 — apex of foretibia. 68 — apex of midtibia. 69 — apex of hind tibia. 70 — wing.

FIGURES 71 – 74. Nilothauma zitoi sp. n., male. 71 — dorsal aspect of hypopygium. 72 — hypopygium with tergite IX and anal point removed, dorsal view left, ventral view right. 73 — superior volsella, dorsal view. 74 — median volsella, dorsal view.

FIGURES 58 – 60. Nilothauma spiesi sp. n., male. 58 — dorsal aspect of hypopygium. 59 — hypopygium with tergite IX and anal point removed, dorsal view left, ventral view right. 60 — superior volsella, dorsal view.

FIGURES 33 – 36. Nilothauma jaraguaense sp. n., male. 33 — dorsal aspect of hypopygium. 34 — hypopygium with tergite IX and anal point removed, dorsal view left, ventral view right. 35 — superior volsella, dorsal view. 36 — median volsella, dorsal view.

FIGURES 6 – 8. Nilothauma amazonense sp. n., male. 6 — dorsal aspect of hypopygium. 7 — hypopygium with tergite IX and anal point removed, dorsal view left, ventral view right. 8 — median and superior volsella, dorsal view.