Nilothauma brayi

Author: (Goetghebuer, 1921)

Diagnosis (n=1, and in part after Adam and Saether, 1999a - in italics)
Exuviae about 4mm long.
Cephalothorax: Cephalic tubercles and frontal warts absent; frontal setae 20µm long. Thoracic horn of 6 slender, equal-sized filaments, one of them with a few spines, each about 375µm (n=1) long. Diameter of basal ring 15-19µm (n=3), oval. Wing sheaths smooth; 2 precorneals, 3 antepronotals and 4 dorsocentrals present; prealar tubercle weakly developed. Thorax with conspicuously large granules near suture (112b.jpg).
Abdomen: Length hook row II 0.53x width tergite; hooks 52. Tergite I bare; II-VI with obvious anterior transverse bands of points; the anterior, median and posterior point bands of tergites II-V completely fused, the points of the anterior band not (?) appreciably larger than the median points. Armament of tergite VII medially interrupted (anterior patch and 1 postero-median or 2 smaller postero-lateral patches). Tergite with a median patch of points (2 very small anterior patches and variable large central, usually triangular patch) (119h.jpg). Conjunctives III/IV and IV/V with 6 rows of spinules extending onto preceding segment. Sternite I without two antero-lateral armed humps. Sternites I-VII bare; VIII with a median patch of points. Pedes spurii A absent; Pedes spurii B II (weakly to) well-developed. Vortex present. Lateral taeniae segments IV-VIII: 1,4,4,4,4; segment I without lateral setae, on segments II-IV: 3,3,2, all hair-like and those on segment IV preceding the taenia. Comb of segment VIII a large pointed tooth terminating a short spur, with one or more small laterals.
Anal segment: Fringe of anal lobe with 27/28 taeniae. Anal lobes with a dorsal taenia situated close to the fringe in the posterior half of the lobes.
(Linked adult male: Langton and Pinder, 2003a)

Species keys out at Page 298: Chironomini 195 Nilothauma of the Text Key.

Palaearctic species: Widespread in Europe.
(For more information see module IdentifyIt – file: Chironominae).

Ecological notes