Tanytarsus bathophilus

Author: Kieffer, 1911

Exuviae 3.5-6.3mm long (m=5.1mm, n=17).
Cephalothorax: Frontal setae 86-110µm long (n=3). Antennal sheaths with a short, broad conical swelling at base. Thoracic horn 465-740µm long (n=8), smooth; ThR 17.2-27.4 (n=4) (144j.jpg). Posterior thoracic mound bulbous. Wing sheaths rounded apically, pearl row absent.
Abdomen: Length hook row II 0.35x width tergite (n=1); hooks 77-95 (n=4). Spine band of tergite III straight for most of its length or only weakly curved outwards (if the line of the spine bases is continued posteriorly it cuts the posterior margin of the segment), bands situated further back on the tergite and overlap setae D5 (144k.jpg). Tergites IV and V with the armament arranged in longitudinal bands. ArR III-VI 1.0-1.35 : 1.0 : 0.37-0.61 : 0.30-0.49 (n=9). Comb of segment VIII 55-105µm wide (n=8); with 8-13 marginal teeth (n=9). Lateral taeniae of segments V-VIII: 1,1(2),2(3),5.
Anal segment: Anal lobe ratio 1.03-1.38 (n=5). Fringe of anal lobe with 34-49 taeniae (m=39, n=20), forming a complete series.
(Linked adult male: Langton and Pinder, 2003a)

Note: Very similar to Tanytarsus gibbosiceps, but easily separated by the lateral taeniate setae of segments V-VIII (3,3,4,4 in gibbosiceps).

Species keys out at Page 482: Tanytarsini 123 Tanytarsus of the Text Key.

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

Ecological notes
Mainly lakes, but also in streams and rivers.