Tanytarsus striatulus

Author: Lindeberg, 1976

Exuviae 3.5-4.6mm long (n=6).
Cephalothorax: Cephalic tubercles small conical, 20µm high. Frontal setae 88-105µm long (n=6). Base of antennal sheath with a minute tubercle, often indiscernible. Thoracic horn smooth, 470-670µm long (n=4) (144h.jpg); ThR 17-27.6 (n=3). Posterior thoracic mound moderately swollen. Wing sheaths rounded apically, pearl row absent.
Abdomen: Length hook row II 0.29x width tergite (n=1); hooks 48, 66 (n=2). Spine bands of tergite III situated further back on the tergite and overlap setae D5, only weakly curved outwards (?). Armament of tergite IV with longer spines in the posterior half, or, very rarely, composed of points only (144i.jpg). Longest spine III 80-90µm long; IV 50-60µm long (n=4). Longest spine IV : III 0.56-0.68 (n=4). Armament tergite IV strong, 105-145µm long (n=5). ArR III-VI 1.1-1.4 : 1.0 : 0.32-0.59 : 0.26-0.41 (n=5). Postero-lateral comb of segment VIII 43-50µm wide; with 5-8 marginal teeth (n=6). Lateral taeniae of segments V-VIII: 0,0,4(2,3),5.
Anal segment: Anal lobe ratio 0.80-1.01 (n=4). Fringe of anal lobe with 24-36 taeniae (n=7), forming a complete series.
(Linked adult male: Lindeberg, 1976a)

Note: Superficially similar to Tanytarsus buchonius, but the lack of taeniae laterally on segments V and VI and the 5 lateral taeniae on VIII will distinguish this species.

Species keys out at Page 494: Tanytarsini 135 Tanytarsus of the Text Key.

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

Ecological notes
Lakes and their outflow streams and rivers.