Nilothauma strebulosum (Adam et Saether) Adam et Saether, 2009

Mendes, Humberto Fonseca & Andersen, Trond, 2009, Neotropical Nilothauma Kieffer, 1921, with the description of thirteen new species (Diptera: Chironomidae), Zootaxa 2063, pp. 1-45 : 36-37

Nilothauma strebulosum (Adam et Saether) comb. n.

( Figs 61–63 )

Paranilothauma strebulosa Adam et Saether, 2000: 21 , Fig. 1 .

Material examined. COSTA RICA: La Selva, holotype male, 16.iii.1993, Malaise trap, O. A. Saether ( ZMBN Type no. 267). COSTA RICA: Rancho Quemado, 2 male paratypes, ix & xii, 1990, W. Riss ( ZSM).

Diagnostic characters. The two dorsal setose lobes on tergite IX and lack of anal point combined with a strongly curved inferior volsella with some apically split setae, and median volsella with strong apical seta will separate the male of N. strebulosum from all other Nilothauma species.

Male. The male is described in detail by Adam and Saether (2000). Hypopygium and superior and median volsellae as in Figures 61–63 .

Female and immatures. Unknown.

Remarks. This species was originally described in Paranilothauma as the two dorsal setose lobes on tergite IX were regarded as belonging to laterosternite IX ( Adam & Saether 2000). The addition of several new Neotropical species with similar lobes clearly demonstrates that these lobes originate on tergite IX. Distribution. This species is recorded only from Costa Rica.

Figures

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 1 – 2. Parsimony analysis of Nilothauma Kieffer species with Paratendipes Kieffer and Pseudochironomus Malloch fixed as outgroup. Characters and character states as in text, matrix of characters as in Appendix 1. strict consensus of shortest tree. 2 — strict consensus of shortest tree after reweighting according to rescaled consistency index.