Tanytarsus nigricollis

Author: Goetghebuer, 1939

Diagnosis (n=1 fragmentary specimen in coll. ZSM)
Exuviae about 3.5mm long.
Cephalothorax: Cephalic tubercles very shallow conical. Thoracic horn without long setulae. Thoracic horn 501/540µm long; ThR 20/30. Wing sheaths rounded apically, pearl row absent.
Abdomen: Tergite II with the anterior point patches separated by a point-free gap medially; anterior and posterior point patches not joined, mid-tergite without points. Armament bands on tergite III composed of spines, but without a field of minute points around the anterior end of the spine bands. Tergites IV and V with the armament arranged in longitudinal bands, the spine band of tergite IV less than three-quarters the length of the band on tergite III, with spines rarely extending the whole length of the bands, which are frequently of points only. Armament tergite IV strong, 80µm long. ArR III-VI 2.0 : 1.0 : 0.88 : 0.63. Postero-lateral comb of segment VIII 38µm wide; with 7 marginal teeth. Lateral taeniae of segments V-VIII: 3,3,4,4.
Anal segment: Fringe of anal lobe with 28 taeniae, forming a complete series beginning near the anterior edge of the lobes.

Note: It is unlikely that the distinction from Tanytarsus usmaensis in the arrangement of point-patches will hold when more associated specimens are obtained, nor the slightly shorter thoracic horn, in which case the pupae of these two species would appear to be identical.

Species keys out at Page 449: Tanytarsini 90 Tanytarsus of the Text Key.

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

Ecological notes