Orthocladius lapponicus

Author: Goetghebuer, 1940

Diagnosis (Material in coll. ZSM)
Small exuviae, less than 5mm long.
Cephalothorax: Thoracic horn elongate, over 200µm but less than 300µm long, extensively armed with points or coarsely toothed. 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. Posterior transverse point band on tergite III not extending further laterally than the apical band. Median point patches of tergites III-V usually completely fused to the posterior band to form a single trapezoidal patch, the points of median and posterior bands of about the same size and form. Points of the median patches on tergites III-V grading antero-laterally into shagreen; tergites IV and V with points of the median patch grading in size from mid-tergite outwards (078f.jpg). 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 lobes without fringe. Apical setae of the anal lobes longer than half the anal lobe length. Apical setae of anal lobes shorter than the length of the lobes and usually hooked apically.
See Soponis, 1977a.

Species keys out at Page 871: Orthocladiinae 282 Orthocladius of the Text Key.

Holarctic species: Fennoscandia.
(For more information see module IdentifyIt – file: Orthocladiinae).

Ecological notes
Far northern lakes.