Paratrissocladius excerptus

Author: (Walker, 1856)

Exuviae 3.9-5.8mm long (n=6) (042-1.jpg).
Cephalothorax: Thoracic horn 385-515µm long, small-toothed (042e.jpg); ThR 3.3-4.5 (n=5).
Abdomen: Hook row II absent, its position occupied by a transverse band of anteriorly directed spinules, which may, however, be folded under the posterior edge of the tergite. Tergites without a median transverse row of strong points. Tergites III-VI with extensive shagreen (042f.jpg); at least on VII and VIII with conspicuous large points medially and/or posteriorly. Pedes spurii B present on segment II. Three or four lateral setae on segments II-VI, not taeniate; lateral taeniae of segment VII 4, VIII 5 (n=6).
Anal segment: Anal lobe ratio 1.6-1.8 (n=5). Fringe of anal lobe with 32-45 taeniae (n=6) (042g.jpg).
(Linked adult male: Langton and Pinder, 2003a)

Species keys out at Page 657: Orthocladiinae 69 Paratrissocladius of the Text Key.
Note: The pupa of Aagaardia sivertseni (Aagaard) described by Saether, 2000a runs here: it differs from P. excerptus in being smaller (c.2.5mm long) and having pedes spurii B of segment II absent or vestigial.

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

Ecological notes
Streams and pools.