Author: (Goetghebuer, 1921)
Diagnosis
Exuviae 5.7-7.4mm long (n=5).
Cephalothorax: Thoracic horn elongate, conspicuous, 410-535µm long (m=497µm, n=11), coarsely toothed; ThR 6.6-9.5 (m=7.5, n=11) (078e.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 0.34x the breadth of segment II, usually of three or more transverse rows of hooks. Point patches on tergites III-V more or less trapezoidal with the points of median and posterior bands of about the same size and form, points grading antero-laterally into shagreen; tergites IV and V with points of the median patch grading in size from mid-tergite outwards (078f.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. Conjunctives without brown blotches. Forked or branched setae rare and usually confined to the apical sternites.
Anal segment: Anal lobes rarely with apical teeth; when present, colourless and small. Anal lobe ratio 1.5-1.9 (m=1.7, n=11). Anal lobes without fringe; length of anal macrosetae 0.56-0.75x length of the anal lobe (n=5).
(Linked adult male: Langton and Pinder, 2003a)
Species keys out at Page 871: Orthocladiinae 282 Orthocladius of the Text Key.
Distribution
West Palaearctic: (S)W+C Europe, Middle East.
(For more information see module IdentifyIt – file: Orthocladiinae).
Ecological notes
Lakes, drains, ditches, streams.