Tanytarsus glabrescens

Author: Edwards, 1929

Exuviae 2.1-2.9mm long.
Cephalothorax: Cephalic tubercles very shallow conical. Frontal setae 75-155µm long. Antennal sheath base with a very weak conical swelling. Thoracic horn 945-1330µm long, without spinules; ThR 14.6-37.8. Posterior thoracic mound with a brownish finger-like projection. Wing sheaths rounded apically. Pearl row absent.
Abdomen: Length hook row II 0.35, 0.49x width tergite (n=2); hooks 72-96 (n=4). Armament of tergites III-VI on slightly yellowed patches. Point patches of tergite III of points only, patches longitudinally broad oval, less than one quarter the length of the segment. Tergites IV and V with the armament arranged in longitudinal bands. Armament tergite IV strong, 105-180µm long (n=6). ArR III-VI 0.86-1.46 : 1.0 : 0.75-1.0 : 0.6-0.95 (n=6). Postero-lateral comb of segment VIII 35-85µm wide, truncate posteriorly, with a marginal row of 4-6 elongate teeth (n=6). Lateral taeniae of segments V-VIII: 0,0,3,4.
Anal segment: Fringe of anal lobe with 13-19 taeniae (n=6), forming a complete series. Anal lobe ratio 1.1-1.6 (n=4).
(Linked adult male: Langton and Pinder, 2003a)

Note: Very similar to Tanytarsus signatus, but the characteristic form of the posterior thoracic mound will confirm.

Species keys out at Page 463: Tanytarsini 104 Tanytarsus of the Text Key.

Holarctic species: widespread in Europe (not Mediterranean).
(For more information see module IdentifyIt – file: Chironominae).

Ecological notes
Lakes and ditches.