Tanytarsus nemorosus

Author: Edwards, 1929

Exuviae 3.5-4.2mm long (n=6).
Cephalothorax: Cephalic tubercles very weak. Frontal setae 45-110µm long (n=5). Antennal sheath base with a small rounded tubercle. Thoracic horn 790-1140µm long, the apical half with numerous small spinule-like teeth, 8-15µm long; ThR 18.4-28.5 (n=6). Posterior thoracic mound weak. Wing sheaths rounded apically, pearl row absent.
Abdomen: Hooks of hook row II 68 (n=1). Small rounded point patches present on tergite II anteriorly; III with points only; IV and V with the armament arranged in longitudinal bands. Armament tergite IV strong, 65-85µm long (n=6). ArR II-VI 0.47-0.84 : 0.71-1.15 : 1.0 : 0.71-1.08 : 0.6-0.97 (n=6). Postero-lateral comb of segment VIII 25-38µm wide (n=5); with 4-10 marginal teeth (n=6). Lateral taeniae of segments IV-VIII: 0,1,3,4,4, taeniae well-developed.
Anal segment: Anal lobe ratio 1.2, 1.4 (n=2). Fringe of anal lobe with 20-33 taeniae (n=6), forming a complete series.
Note: Very similar to Tanytarsus curticornis which has 5 lateral taeniae on VIII, shorter, denser spinules on the thoracic horn and shorter dorsocentral setae.
(Linked adult male: Langton and Pinder, 2003a)

Species keys out at Page 455: Tanytarsini 96 Tanytarsus of the Text Key.

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

Ecological notes
Lakes and ponds.