Sergentia baueri

Author: Wülker, Kiknadze, Kerkis and Nevers, 1999

Diagnosis (Karyotypically identified material from W. Wülker.)
Exuviae 5.6-9.8mm long (m=7.4mm, n=25).
Colour: Dark exuviae with gold to brown combs on segment VIII (care: old specimens, particularly those preserved in alcohol may become pale; it is also possible that some environmental conditions will generate pale baueri, or darker Sergentia prima).
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: Anterior and median points of tergites III and IV of similar size (this distinction is best observed under low power); anterior band points grading in size to the median points generating the effect of a wide but indistinct band, broadly joined to the median patch. Lateral shagreen of sternites III and IV directed posteriad, irregularly arranged or in more or less horizontal rows. Conjunctives unmarked laterally.
Anal segment: Anal lobes with 28-63 taeniae (m=49.6, n=25); 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.

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

Ecological notes
Pools and occasionally lakes.