Orthocladius oblidens

Author: (Walker, 1856)

Exuviae 3.6-5.9mm long (m=4.8mm, n=17) (076-1.jpg).
Cephalothorax: Thoracic horn elongate, 335-470µm long (m=410µm, n=13) (076b.jpg); ThR 5.4-9.4 (m=6.8, n=11). 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. Apical point band of tergite III extending about half as far laterally as the posterior band (076c.jpg). Pedes spurii B on segment II conspicuous.
Anal segment: Anal lobe ratio 1.1-1.9 (m=1.5, n=10). Anal lobes without fringe, with additional apical teeth. Length of anal macrosetae 0.28-0.45x length of the anal lobe (m=0.34, n=13) (076d.jpg).
(Linked adult male: Langton and Pinder, 2003a)

Species keys out at Page 861: Orthocladiinae 272 Orthocladius of the Text Key.

Holarctic species: widespread in Europe, north Africa.
(For more information see module IdentifyIt – file: Orthocladiinae).

Ecological notes
Streams, rivers, ditches, lakes.