Orthocladius pedestris

Author: Kieffer, 1909

Exuviae 4.3-5.5mm long (m=5.0mm, n=10) (079-2.jpg).
Colour: Exuviae usually very dark; conjunctives III/IV-VIII/IX blotched with small dark brown spots on transparent cuticle.
Cephalothorax: Thoracic horn elongate, 230-445µm long (m=354µm, n=10), extensively armed with points (079f.jpg); ThR 4.5-7.4 (n=8). Four dorsocentral setae, the first, third and fourth thick, the second conspicuously thinner.
Abdomen: Hook row II a discrete pad or band of hooks, less than 0.34x width of segment II, usually of three or more transverse rows of hooks. Tergites more extensively armed (e.g. on III the median point patch laterally overrunning the anterior adhesion marks and then spreading into antero-lateral corners), anteriorly extending beyond the anterior adhesion marks in the middle (e.g. on VI leaving only a small antero-median bare space), the points small, about 7µm long, and dense (079g.jpg). Median and posterior point patches on tergites III-V(VI) fused and trapezoidal with the points of median and posterior bands of about the same size and form, or median and posterior points of different form and size, at least on tergite III. Points of the median patches on tergites III-V grading antero-laterally into shagreen. Points of the posterior transverse band of tergite III not obviously smaller than those of both the median and the apical bands. Posterior transverse point band on tergite III not extending further laterally than the apical band. No granulation present on tergites and sternites. Sternites II and III extensively and strongly shagreened. Pedes spurii B on segment II conspicuous. Forked or branched setae rare and usually confined to the apical sternites.
Anal segment: Anal lobe ratio 1.4-1.7 (m=1.6, n=10). Anal lobes without fringe. Length of anal macrosetae 0.49-0.62x length of the anal lobe (m=0.57, n=10); setae thin, about 4µm wide. Apical teeth of anal lobes usually large, brown and often fused at base, but can be smaller and pale (079h.jpg).
(Linked adult male: Langton and Pinder, 2003a)

Species keys out at Page 869: Orthocladiinae 280 Orthocladius and Page 876: Orthocladiinae 287 Orthocladius of the Text Key.

Widespread in (W+C) Europe, Canary Islands.
(For more information see module IdentifyIt – file: Orthocladiinae).

Ecological notes
Streams, rivers, montane lakes.