Tanytarsus lactescens

Author: Edwards, 1929

Exuviae 2.9-3.0mm long (n=2).
Cephalothorax: Cephalic tubercles shallow conical. Frontal setae very thin, 55µm long (n=2). Antennal sheath base with a short conical tubercle. Thoracic horn 400-445µm long, horn without spinules; ThR 12.7-16.4 (n=5). Posterior thoracic mound at most moderately swollen. Wing sheaths rounded apically, pearl row absent.
Abdomen: Hooks of hook row II 62-77 (n=3). Small rounded point patches present on tergite II anteriorly; III with patches of points only; IV and V with the armament arranged in longitudinal bands. Armament tergite IV strong, 45, 60µm long (n=2). ArR II-VI 0.48, 0.55 : 0.72, 1.0 :1.0 : 0.92, 1.0 : 0.8, 1.0 (n=2). Postero-lateral comb of segment VIII 18, 20µm wide; with 3-5 marginal teeth (n=2). Lateral taeniae of segments IV-VIII: 0,1,2/3,4,4, taeniae well-developed.
Anal segment: Anal lobe 133-145µm long. Anal lobe ratio 1.36, 1.5 (n=2). Fringe of anal lobe with 25-27 taeniae, forming a complete series.
(Linked adult male: Langton and Pinder, 2003a)

Note: Despite the very small size of this exuviae, the fringe taenia number and hook number of hook row II are similar to those of related, larger species.

Species keys out at Page 456: Tanytarsini 97 Tanytarsus of the Text Key.

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

Ecological notes