Orthocladius thienemanni

Author: Kieffer, 1906

Diagnosis (in part after Soponis, 1990a - in italics)
Exuviae 3.5-4.4mm long (n=4).
Cephalothorax: Frontal warts weak to moderately developed; cephalic tubercles absent. Antennal sheath base without a sharp tooth. Thoracic horn 50-65µm long (n=3); ThR 2.0-2.6 (n=3). Thoracic horn ellipsoid, light brown, filled or clear, stalked. Precorneals clumped, weak to strong, 1.25x as long as dorsocentrals; 2 median antepronotals, 1 lateral antepronotal, 3 dorsocentrals in a row, narrow, thicker than precorneals. Thorax dorsally wrinkled to granulose anteriorly along eclosion line.
Abdomen: Tergite I bare; III-VIII with 2-4 rows of strong points along posterior margin; II-VIII with central patch of spines anteriorly. Tergites III-VIII with a conspicuous posterior transverse band of small points, 3-7 points deep, extending three fifths to one half the breadth of the segment (073l.jpg). Sternites I and VIII bare; II-VII with 2 off-center point patches anteriorly. Sternites V-VIII with very little row shagreen. Pedes spurii A and B absent. Dorsal setae I-VIII: 4,5,5,5,5,5,5,1; Ventral setae I-VIII: 1,3,3,3,3,3,3,0; Lateral setae I-VIII: 1,3,3,3,3,3,3,4; Od setae I-VIII: 0,0,0,0,0,0,0,0.
Anal segment: Anal lobe greatly reduced, one seta at midpoint. Genital sheaths extended beyond lobe in male and female.
(Linked adult male: Langton and Pinder, 2003a)

Species keys out at Page 846: Orthocladiinae 257 Orthocladius of the Text Key.

Holarctic species: widespread in Europe, circum-Mediterranean.
(For more information see module IdentifyIt – file: Orthocladiinae).

Ecological notes
Streams and rivers.