Rheocricotopus chalybeatus

Author: (Edwards, 1929)

Exuviae 2.5-3.7mm long (m=3.1mm, n=16).
Cephalothorax: Thoracic horn small-toothed, 180-260µm long (m=224µm, n=16); ThR 5.1-6.8 (m=6.0, n=11) (046f.jpg).
Abdomen: Tergites without a median transverse row of strong points. Tergites III-VIII with restricted shagreen, tergite VII with conspicuous large points posteriorly, posterior margin of tergite VIII armed at most with small points (046g.jpg). Three or four lateral setae on segments II-VI, not taeniate; lateral taeniae of segments VII-VIII: 4,5.
Anal segment: Anal lobe ratio 1.5-1.9 (m=1.7, n=14). Fringe of anal lobe with 19-26[35] taeniae (m=23, n=18).
(Linked adult male: Langton and Pinder, 2003a)

Species keys out at Page 659: Orthocladiinae 71 Rheocricotopus of the Text Key.

Palaearctic species: widespread in Europe (not Fennoscandia), circum-Mediterranean, see also Rheocricotopus chalybeatus bicoloratus.
(For more information see module IdentifyIt – file: Orthocladiinae).

Ecological notes
Streams and rivers.