Orthocladius vaillanti

Author: Langton and Cranston, 1991

Diagnosis (Material in coll. ZSM)
Exuviae 5.5-5.9mm long (n=3).
Cephalothorax: Thoracic horn thin-walled and fragile (072e.jpg). Four dorsocentral setae, the first, third and fourth thick, the second conspicuously thinner.
Abdomen: Segments with a dark brown anterior transverse band continued posteriorly along the lateral adhesion marks, the rest of the tergites and sternites paler. 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-VI(VII) nearly or completely covered with points between the lateral adhesion marks (072d.jpg). Pedes spurii B on segment II conspicuous. Length lateral setae of segment VIII 0.45-0.58x length of segment VIII (n=3).
Anal segment: Anal lobe ratio 1.4, 1.5 (n=2). Anal lobes without taeniate fringe, but with an extensive fringe of hair-like teeth (072f.jpg). Length of anal macrosetae 0.35, 0.5x length of the anal lobe (n=2).

Species keys out at Page 860: Orthocladiinae 271 Orthocladius of the Text Key.

Holarctic species: France, Algeria.
(For more information see module IdentifyIt – file: Orthocladiinae).