Tanytarsus palmeni

Author: Lindeberg, 1967

Exuviae 3.8-5.3mm long (m=4.3mm, n=14) (145-1.jpg).
Cephalothorax: Cephalic tubercles very shallow cones. Frontal setae 50, 86µm long (n=2). Base of antennal sheath with a large, acutely conical projection, which is usually very obvious on one or both sides of an exuvial mount (145b.jpg). Thoracic horn spinulate at least at tip (145c.jpg). Thoracic horn 188-360µm long (295.5µm, n=11); ThR 16.3-25.0 (n=4). Posterior thoracic mound weak. Wing sheaths rounded apically, pearl row absent.
Abdomen: Length hook row II 0.25, 0.28x width tergite (n=5). Spine band of tergite III only weakly curved outwards, situated further back on the tergite where it overlaps seta D5. Tergites IV and V with the armament arranged in longitudinal bands. Armament tergite IV strong, 86-171µm long (m=132µm, n=13), consisting of spines decreasing in length posteriorly (145d.jpg). ArR III-VI 0.60-1.15 : 1.0 : 0.31-0.90 : 0.25-0.50 (n=13). Longest spine IV : III 0.19-0.4 (n=4). Postero-lateral comb of segment VIII 34-50µm wide (m=41.6µm, n=11); with 3-8 marginal teeth (m=6.1, n=14). Lateral taeniae of segments V-VIII: 0,0,1(2),5.
Anal segment: Anal lobe ratio 1.24-1.42 (n=5). Fringe of anal lobe with 25-39 fine and closely set taeniae (m=30.9, n=14), forming a complete series (145e.jpg).
(Linked adult male: Langton and Pinder, 2003a)

Note: Part of the Tanytarsus lestagei aggregate.

Species keys out at Page 493: Tanytarsini 134 Tanytarsus of the Text Key.

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

Ecological notes