Author: Saether and Schnell, 1988
Diagnosis (n=1; in part after Saether and Schnell, 1988a - in italics)
Exuviae 4.7mm long.
Cephalothorax: Cephalic tubercles absent. Frontal warts on frontal apotome, conspicuous (040c.jpg). Thoracic horn 360µm long, small-toothed (040d.jpg); ThR 7.2. Wing sheats with fine marginal lines.
Abdomen: Armed tergites with small points which are gradually a little larger posteriorly on each segment (040a.jpg). Tergite I and IX bare; II weak median shagreen; III-VI stronger posterior shagreen; VII-VIII weak antero-median. Tergites without a median transverse row of strong points. Segment VII apico-laterally projecting posteriorly and stiffened with a dark embedded spine (similar to those found in Genus Zalutschia); segment VI shows a similar but much weaker structure (040a.jpg). Sternite I bare; II-II with weak anterior and median shagreen; IV-VII with weak anterior shagreen and a few posterior points on VI. Sternite of male armed with a posterior band of conspicuous points along the evenly curved posterior margin; of female with a pair of triangular projections, each stiffened with an embedded spine (039h.jpg). Pedes spurii A present on sternites IV-VII(VIII); pedes spurii spurii B wider than high. Lateral setae on I-VIII: 1-2(4):3:3:3:3:3:3-4:5, 3 taeniate on VII, 4(5) taeniate on VIII.
Anal segment: Anal lobe ratio 1.7. Fringe of anal lobe with 17/18 taeniae (040a.jpg). Male genital sheaths overreaching anal lobes.
(Linked adult male: Langton and Pinder, 2003a)
Species keys out at Page 625: Orthocladiinae 37 Heterotrissocladius of the Text Key.
Distribution
Holarctic species: northern Europe.
(For more information see module IdentifyIt – file: Orthocladiinae).
Ecological notes
Northern lakes.
Lindegaard, 1997: N