Author: (Meigen, 1838)
Diagnosis
Exuviae 3.6-4.8mm long (m=4.4mm, n=12) (122-1.jpg).
Cephalothorax: Cephalic tubercles shallow humps; frontal setae 50, 85µm long (n=2). Thoracic horn of a few (about 10) branches. Thorax with conspicuously large granules near suture (112b.jpg).
Abdomen: Length hook row II 0.43-0.62x width tergite (m=0.52, n=10); hooks 52-83 (n=7); with a small field of point-like hooks at each end (122b.jpg). Armament of tergites II-V continuous: an anterior transverse band of points joined broadly to the postero-median trapezoidal or rectangular marmorate patch of smaller points(# 122c.jpg). Tergites III and IV armed with an apical band of points or hooks, set well back on the tergite, with a point-free space in front. Tergite VII without trace of a median point patch. Sternite I without two antero-lateral armed humps. Pedes spurii B II present. Conjunctives with points no larger than those of the anterior transverse bands of the tergites. Vortex present. Comb of segment VIII a dark narrow spur of 3-7 teeth (122d.jpg). Lateral taeniae of segments V-VIII: 3(2),3(2),4,4, well-developed.
Anal segment: Fringe of anal lobe with 19-35 taeniae (m=27, n=24) (122d.jpg). At most 1 dorsal seta, seta set towards the inner edge of the lobe.
(Linked adult male: Langton and Pinder, 2003a)
Species keys out at Page 320: Chironomini 217 Polypedilum of the Text Key.
Distribution
Holarctic species: widespread in Europe.
(For more information see module IdentifyIt – file: Chironominae).
Ecological notes
Lakes and streams, particularly in montane regions.