Author: (Meigen, 1818)
Diagnosis
Exuviae 3.0-4.8mm long (m=4.0mm, n=57) (077-1.jpg).
Cephalothorax: Thoracic horn elongate, 145-345µm long (m=257µm, n=36) (077b.jpg); ThR 5.5-12.0 (m=8.7, n=35). 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 II-V normally with a postero-lateral patch of granules extending the hook row and apical bands to tergite margin; ventrally on segments I-V these may be complete across the sternites or medially broken. Median point bands of tergites III-VI very transverse; separate from the posterior band, joined to it laterally or joined to it medially as well, but usually distinct (077c.jpg). Points of median and posterior bands of much the same size and form. Posterior transverse point band on tergite III not extending further laterally than the apical band. Pedes spurii B on segment II conspicuous. Forked or branched setae rare and usually confined to the apical sternites. Lateral setae of the posterior segments shorter and thinner than in Orthocladius dentifer; seta 2 VII 28-72µm long (m=56µm, n=25); seta 4 VIII 40-123µm long (m=76µm, n=25).
Anal segment: Anal lobe ratio 1.2-2.3 (m=1.7, n=30). Anal lobes without fringe. Anal lobes with apical teeth; anal macrosetae 0.51-0.82x length of the anal lobe (m=0.64, n=16), usually strongly hooked at tip (077d.jpg).
(Linked adult male: Langton and Pinder, 2003a)
Species keys out at Page 865: Orthocladiinae 276 Orthocladius of the Text Key.
Distribution
Holarctic species: widespread in Europe.
(For more information see module IdentifyIt – file: Orthocladiinae).
Ecological notes
Streams, rivers and lakes.