Form described by Langton, 1991
Diagnosis
Exuviae 4.0-4.9mm long (n=8).
Cephalothorax: Frontal setae present. Thoracic horn of a few (about 10) branches, branches much shorter than half the length of the abdomen. Thorax with conspicuously large granules near suture (112b.jpg).
Abdomen: Length hook row II 0.28-0.41x width tergite (n=4); hooks 36-53 (n=7). Tergites II-VI with obvious anterior transverse bands of points stronger than those of the median patch with which they may be confluent for the tergite width. Tergite VII without trace of a median point patch. Armament of tergites II and III continuous and extensive, rectangular in outline or narrowed posteriorly, with only a small bare median posterior patch (122g.jpg). On tergites IV-VI the median point patch is conspicuously marmorate and progressively reduced. Two segments with an apical band of points: III and IV. 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 usually in the form of a single outer strong tooth with a number of smaller teeth within, projecting from the posterior edge of the segment (124j.jpg). (Some specimens possess only the strong outer tooth, while others have two or three strong outer teeth (122k.jpg).) Lateral taeniae of segments IV-VIII: 0,3,3,4,4, taeniae well-developed.
Anal segment: Each anal lobe with 19-26 fringe taeniae (n=8) and at most 1 dorsal seta which is set towards the inner edge of the lobe.
Note: This is possibly just a variety of Polypedilum uncinatum.
Form keys out at Page 316: Chironomini 213 Polypedilum of the Text Key.
Distribution
(For more information see module IdentifyIt – file: Chironominae).
Ecological notes
Northern lakes.