Cryptochironomus rostratus

Author: Kieffer, 1921

Exuviae 6.8-7.2mm long (n=4).
Cephalothorax: Cephalic tubercles 215-310µm long (n=4); 1.6x higher than broad.
Abdomen: Hook row II medially interrupted, length of row 0.13-0.18 (0.22-0.29 gap) 0.15-0.16x width tergite (n=4) (113p.jpg). Tergites II-VII(VIII) with a complete posterior transverse row or narrow band of strong points; points III-VIII: 27-33, 25/29, 23-31, 22-28, 17-27, 0-19 (n=4). Posterior points of sternite II grouped medially to form a transversely oval toothed mound; points III-VIII: 22-28, 18-26, 17-29, 17-25, 16-20, 0 (n=4). Tergites I-VIII/IX are covered with reticulation, at least tergites I-V with obvious continuous reticulation; reticulation of tergites thick-walled (113k.jpg). Comb of segment VIII absent. Lateral taeniae of segments V-VIII: 4,4/5,4,5.
Anal segment: Fringe of anal lobe with 55-60 taeniae (n=2). Forked anal processes present (113e.jpg).
(Linked adult male: Langton and Pinder, 2003a)

Species keys out at Page 349: Chironomini 246 Cryptochironomus of the Text Key.

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

Ecological notes
Lakes and rivers.