Orthocladius wetterensis

Author: Brundin, 1956

Exuviae 4.5-5.8mm long (n=4).
Cephalothorax: Thoracic horn elongate, 225-350µm long (n=5), broad and contracted strongly in its apical half, with small teeth; ThR 3.7-4.7 (n=5) (078h.jpg). 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 0.34 the breadth of segment II, usually of three or more transverse rows of hooks. Median point patches of tergites III-V partly fused to the posterior band; points of posterior transverse band of tergite III obviously smaller than those of the median and apical bands (078i.jpg). Posterior transverse point band on tergite III not extending further laterally than the apical band. No granulation present on tergites and sternites. Pedes spurii B on segment II conspicuous. Forked or branched setae rare and usually confined to the apical sternites.
Anal segment: Anal lobe ratio 1.3-1.8 (n=5). Anal lobes without taeniate fringe and apical teeth, but a lateral fringe of hair-like teeth may be weakly developed. Length of anal macrosetae 0.52-0.87x length of the anal lobe and usually hooked apically (n=5).
(Linked adult male: Langton and Pinder, 2003a)

Species keys out at Page 873: Orthocladiinae 284 Orthocladius of the Text Key.

NW+C Europe.
(For more information see module IdentifyIt – file: Orthocladiinae).

Ecological notes
Flowing and stagnant water.