Psectrocladius sordidellus

Author: (Zetterstedt, 1838)

Exuviae 3.3-6.1mm long (m=5.0mm, n=36).
Cephalothorax: Frontal setae present. Thoracic horn 255-430µm long (m=346µm, n=37), small-toothed; ThR 4.6-8.0 (m=6.1, n=16). Longest precorneal seta relatively longer than in Psectrocladius zetterstedti Brundin, e.g. for exuviae 4.7mm long, it is 165µm long.
Abdomen: Tergites III-VIII with restricted shagreen, at least on VII and VIII. Median point patches on tergites IV-VI; patches single, at least on tergites IV and V obviously so; occasionally constricted medially on VI. Points of point patches large, the longest greater than 35µm long, usually obviously exceeding the length of the longest tooth of the posterior transverse rows. Three or four lateral setae on segments II-V, not taeniate; four lateral taeniae on segment VI reduced to setae proceeding from anterior to posterior (048l.jpg). At least one lateral seta on segment VII, and all those on segment VIII taeniate.
Anal segment: Anal lobes rounded apically, without teeth. Anal lobe ratio 1.8-2.3 (m=2.0, n=42). Fringe of anal lobe with 22-42 taeniae (m=32, n=63). The three anal macrosetae situated apically on the anal lobes.
(Linked adult male: Langton and Pinder, 2003a)

Note: Similar to Psectrocladius ventricosus Kieffer, a species from brackish water.

Species keys out at Page 679: Orthocladiinae 91 Psectrocladius of the Text Key.

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

Ecological notes
Stagnant fresh water and slow flowing drains.