Tanytarsus pe22

Form described by Langton, 1991

Diagnosis (n=1)
Exuviae 4.8mm long.
Cephalothorax: Frontal setae 100µm long. Thoracic horn 950µm long; ThR 13.6. Thoracic horn over the middle half with setulae, 78µm long; length 1.1x width horn (138c.jpg). Wing sheaths rounded apically, pearl row absent.
Abdomen: Length hook row II 0.34x width tergite; hooks 98. Tergites II and VI without anterior point patches. Tergite III possessing spines; longest spine III 78µm long. Tergites IV and V with the armament arranged in longitudinal bands. Armament tergite IV strong, 143µm long. ArR III-V 1.6 : 1.0 : 0.44. Postero-lateral comb of segment VIII 60µm wide; with 8/9 marginal teeth. Lateral taeniae of segments V-VIII: 0,0,1,4.
Anal segment: Anal lobe ratio 1.3. Fringe of anal lobe with 52/55 taeniae, forming a complete series.

Form keys out at Page 444: Tanytarsini 85 Tanytarsus of the Text Key.

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

Ecological notes
River Somme (France).