Sergentia pe1

Form described by Langton, 1980

Exuviae 7.6-9.8mm long (m=8.4mm, n=50).
Colour: Pale exuviae, thorax gold to brown, comb of segment VIII gold.
Cephalothorax: Cephalic tubercles more or less cylindrical, truncate and capped with fine spinules, usually about 100µm long; frontal setae present (120k.jpg). Thoracic horn with 6-10 branches. Thorax with a narrow band of small granules along the suture.
Abdomen: Tergites II-VI with obvious anterior transverse bands of points stronger than those of the median patch. Tergites III-V with median patch somewhat triangular, narrowly attached to anterior band medially, very marmorate with some of the circular bare patches amalgamated and frequently only one or two points between spaces. Tergites III and IV with an apical band of points. Conjunctives unmarked laterally. Vortex present.
Anal segment: Anal lobes with few taeniae (22-42, m=31.6, n=49), the median taeniae largest and more widely separated.

Form keys out at Page 294: Chironomini 191 Sergentia of the Text Key.

NW. Europe.
(For more information see module IdentifyIt – file: Chironominae).

Ecological notes