Tanytarsus pseudolestagi

Author: Shilova, 1976

Diagnosis (Material in coll. B. Lindeberg)
Exuviae 3.8-4.4mm long (n=5).
Cephalothorax: Cephalic tubercles very short cones. Frontal setae 60-70µm long (n=4). Base of antennal sheath with a large, acutely conical projection, which is usually very obvious on one or both sides of an exuvial mount. Thoracic horn 250-330µm long; ThR 16.5-18.5 (n=3). Thoracic horn spinule 5-8µm long (n=3). Posterior thoracic mounds moderate. Wing sheaths rounded apically, pearl row absent.
Abdomen: Length hook row II 0.23x width tergite (n=2); hooks 55-72 (n=5). Spine bands of tergite III situated further back on the tergite and overlap setae D5, only weakly curved outwards (?). Armament of tergite IV usually with long spines. Longest spine tergite III 53-95µm long; IV 18-60µm long. Longest spine IV : III 0.24-0.75 (n=5). Armament tergite IV strong, 120-160µm long (n=5). ArR III-VI 0.78-1.2 : 1.0 : 0.3-0.83 : 0.28-0.34 (n=5). Postero-lateral comb of segment VIII 30-48µm wide; with 6-11 marginal teeth (n=5). Lateral taeniae of segments V-VIII: 0,0,2,5.
Anal segment: Anal lobe ratio 1.24-1.42. (n=5). Fringe of anal lobe with 18-24 taeniae, forming a complete series; taeniae stout and widely spaced posteriorly, progressively thinner and more closely set anteriorly (145h.jpg).

Note: Part of the Tanytarsus lestagei aggregate.

Species keys out at Page 491: Tanytarsini 132 Tanytarsus of the Text Key.

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

Ecological notes
Northern lakes.