Polypedilum nubeculosum

Author: (Meigen, 1804)

Exuviae 5.9-8.5mm long (m=6.9mm, n=40) (125-1.jpg).
Cephalothorax: Cephalic tubercles weakly rounded mounds. Frontal setae 50-85µm long (n=4). Thoracic horn 8-branched, branches much shorter than half the length of the abdomen. Thorax with conspicuously large granules near suture (112b.jpg).
Abdomen: Length hook row II 0.50-0.71x width tergite (m=0.55, n=12); hooks 58-75 (m=64, n=15). Tergites II-VI with obvious anterior transverse bands of points stronger than those of the median patch; apical bands III and IV complete. Median points of tergite III obviously smaller than the apical points; median points of II smaller still. Armament of tergites II-V discontinuous: at least the anterior transverse point band separate from the postero-median patch (125b.jpg). Posterior transverse point band of tergites IV-VI medially broken, only occasionally with a few small points bridging the gap between the two halves. Tergite VII without trace of a median point patch. Sternite I without two antero-lateral armed humps. Pedes spurii B II well-developed. Conjunctives with points no larger than those of the anterior transverse bands of the tergites. Vortex present. Comb of segment VIII an elongate compound spur (125c.jpg). Lateral taeniae of segments IV-VIII: 0,3,3,4,4, taeniae well-developed.
Anal segment: Anal lobes without a dorsal seta (125d.jpg). Fringe of anal lobe with 30-55 taeniae (m=40.6, n=71).
(Linked adult male: Langton and Pinder, 2003a)

Species keys out at Page 328: Chironomini 225 Polypedilum of the Text Key.

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

Ecological notes
Stagnant and slow flowing water.