Orthocladius abiskoensis

Author: Thienemann and Krüger, 1937

Diagnosis (Material in coll. ZSM; in part after Soponis, 1990a: p. 14-15 - in italics)
Length 3.0-4.25mm
Cephalothorax: Cephalic tubercles absent, frontal warts weak. Antennal sheath base without a sharp tooth. Thoracic horn absent. Precorneals clumped; 2 median antepronotals, 1 lateral antepronotal, moderately developed; 4 dorsocentrals, slightly shorter than precorneals but thicker; arrangement varies. Thorax dorsally slightly wrinkled along eclosion line.
Abdomen: Segments without anterior point patches. Tergites II-V with apical bands of small, anteriorly directed hooks or spines. Tergites III-VIII with large central patch of points separated from posterior point patch. Dorsal setae I-VIII: 4,5,5,5,5,5,5,2; Ventral setae I-VIII: 1,4,4,4,4,4,4,1; Lateral setae I-VIII: 1,3,3,3,3,3,4,4; Od setae I-VIII: 0,0,0,0,0,0,0,0.
Anal segment: Anal lobes narrowed to tips which are often inturned; with two macrosetae robust or fine, one on proximal half and one at midpoint. Anal lobes without fringe. Genital sheaths extended beyond lobe in male, not in female.

Species keys out at Page 842: Orthocladiinae 253 Orthocladius of the Text Key.

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

Ecological notes
Cold streams, rivers and springs.