Tanytarsus longitarsis

Author: Kieffer, 1911

Exuviae 3.3-5.2mm long (n=3).
Cephalothorax: Cephalic tubercles short broad cones. Frontal setae 90, 111µm 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. Thoracic horn 200-350µm long (n=5), spinule 8µm long; ThR 14.3-16.0 (n=3). Posterior thoracic mound moderate. Wing sheaths rounded apically, pearl row absent.
Abdomen: Hooks of hook row II 76 (n=1). Tergites III-VI with the armament arranged in longitudinal bands. Spine band of tergite III only weakly curved outwards, situated further back on the tergite and overlapping seta D5. Armament tergite IV strong, 129-171µm long (n=3), usually of points only (145g.jpg). ArR III-VI 0.8-1.09 : 1.0 : 0.45-0.47 : 0.20-0.33 (n=3). Longest spine tergite III 85-103µm long; IV 30-60µm long (n=4); longest spine IV : III 0.35-0.83 (n=4). Comb of segment VIII 43-55µm wide; with 5-9 marginal teeth (n=4). Lateral taeniae of segments V-VIII: 0,0,0(1),5.
Anal segment: Anal lobe ratio 1.5 (n=1). Fringe of anal lobe with 27-33 taeniae (n=4), forming a complete series, stout and widely spaced posteriorly, progressively thinner and more closely set anteriorly (145h.jpg).
(Linked adult male: Langton and Pinder, 2003a)

Note: Part of the Tanytarsus lestagei aggregate.

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

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

Ecological notes
Stagnant water.