Tanytarsus pe11

Form described by Langton, 1991

Exuviae 4.5-5.7mm long (n=4).
Cephalothorax: Cephalic tubercles obvious, 30, 33µm long (n=2). Frontal setae 93-105µm long (n=3). Base of antennal sheath with a large, acutely conical projection, which is usually very obvious on one or both sides of an exuvial mount. Thoracic horn not, or hardly, spinulate; horn 340-490µm long; ThR 12.3-19.6 (n=3). Posterior thoracic mound large. Wing sheaths rounded apically, pearl row absent.
Abdomen: Length hook row II 0.28x width tergite; hooks 77-88 (n=3). Spine band of tergite III curved outwards so that if the line of the spine bases is extended posteriorly it cuts the lateral margin of the segment; bands situated further back on the tergite and overlap setae D5. Tergites IV and V with the armament arranged in longitudinal bands. Armament of tergite IV with spines increasing in length posteriorly (145i.jpg). Longest spine IV : III 0.32-0.91 (n=4). Armament tergite IV strong, 170-200µm long (n=4). ArR III-VI 1.1-1.2 : 1.0 : 0.50-0.72 : 0.29-0.44 (n=4). Comb of segment VIII 47-60µm wide; with 6-10 marginal teeth (n=4). Segment VIII with five lateral taeniae.
Anal segment: Anal lobe ratio 0.97-1.15. (n=4). Fringe of anal lobe with 32-39 fine and closely set taeniae, forming a complete series.

Note: Part of the Tanytarsus lestagei aggregate, possibly the pupa of Tanytarsus dispar Lindeberg.

Form keys out at Page 492: Tanytarsini 133 Tanytarsus of the Text Key.

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

Ecological notes
Rivers and lakes.