Tanytarsus sinuatus

Author: Goetghebuer, 1936

Diagnosis (n=2, unless stated otherwise, material in coll. ZSM)
Exuviae 4.4, 4.9mm long (n=2).
Cephalothorax: Cephalic tubercles (50µm long, 25µm wide at base) with a short conical base and a nearly cylindrical apex (25-30µm long, 13-15µm broad) (142b.jpg). Frontal setae 88, 100µm long. Antennal sheath base with a conical projection. Thoracic horn 305-438µm long (n=4); ThR 10.4-16 (n=3). Posterior thoracic mound weak. Thoracic granulation restricted to sutural margins. Wing sheaths rounded apically, pearl row absent. Nose very variably developed from small and distinct to absent.
Note: The two specimens seen have no trace of setulae on the thoracic horn (142c.jpg).
Abdomen: Length hook row II 0.37, 0.41x width tergite; hooks 93-113 (n=4). Point patches of tergite III longitudinally elongate, narrow, tapering posteriorly and greater than one quarter the length of the segment (142a.jpg). Tergites IV and V with the armament arranged in longitudinal bands. Armament tergite IV strong, 178, 183µm long. ArR III-VI 1.0, 1.1 : 1.0 : 1.04 : 0.62, 0.73. Postero-lateral comb of segment VIII 33-55µm wide; with 5-8 marginal teeth (n=5). Lateral taeniae of segments V-VIII: 0,0,0,4 (taeniae very narrow).
Anal segment: Anal lobe ratio 1.17, 1.23. Fringe of anal lobe with 33-43 taeniae (n=5), forming a complete series.

Species keys out at Page 468: Tanytarsini 109 Tanytarsus of the Text Key.

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

Ecological notes
Alpine seepages.