Tanytarsus quadridentatus

Author: Brundin, 1947

Exuviae 3.0-4.3mm long (n=10).
Cephalothorax: Cephalic tubercles short conical. Frontal setae 60µm long (n=1). Antennal sheath base with a conical swelling, as high as broad. Thoracic horn 300-575µm long (n=5); ThR 17.6-28.3 (n=4). Posterior thoracic mound conspicuously swollen. Wing sheaths rounded apically, pearl row absent.
Abdomen: Armament of tergite III of spines, IV of spines or points, V and VI of points (139f.jpg). Tergites IV and V with the armament arranged in longitudinal bands. Armament tergite IV strong, 125-180µm long (n=8). ArR III-VI 0.89-1.14 : 1.0 : 0.44-0.9 : 0.27-0.42 (n=8). Postero-lateral comb of segment VIII 30-45µm wide (n=8); with 4-9 marginal teeth (n=9). Only one lateral taenia on segment VIII (139g.jpg).
Anal segment: Fringe of anal lobe with 16-26 taeniae (n=10), forming a complete series.
(Linked adult male: Langton and Pinder, 2003a)

Species keys out at Page 440: Tanytarsini 81 Tanytarsus of the Text Key.

Holarctic species: widespread in Europe.
(For more information see module IdentifyIt – file: Chironominae).

Ecological notes