Sergentia prima

Author: Proviz and Proviz, 1997

Diagnosis (Karyotypically identified material from W. Wülker.)
Exuviae 6.4-7.8mm long (m=7.2mm, n=14).
Colour: Pale exuviae with combs of segment VIII golden-yellow.
Cephalothorax: Cephalic tubercles about 100µm long, more or less cylindrical, truncate and capped with fine spinules. Thoracic horn with 6-10 branches. Thorax with a narrow band of small granules along the suture.
Abdomen: Median points of tergites III and IV very small (almost invisible under low power), contrasting with the much larger points of the anterior transverse band. Lateral shagreen of sternites III and IV directed posteriad, irregularly arranged or in more or less horizontal rows (occasionally apparently absent). Conjunctives unmarked laterally.
Anal segment: Anal lobes with 45-68 taeniae (m=59.4, n=14); taeniae usually in a single row, all similar in size and more or less evenly spaced over the middle 2/3rds of the lobes.

Species keys out at Page 296: Chironomini 193 Sergentia of the Text Key.

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

Ecological notes
Shallow lakes.