Psectrocladius brehmi

Author: Kieffer, 1923

Diagnosis (n=2, unless stated otherwise, material in coll. ZSM)
Exuviae 3.6, 4.1mm long.
Cephalothorax: Frontal setae present. Thoracic horn 288, 295µm long, small-toothed; ThR 5.6, 6.8.
Abdomen: Tergites III-VIII with restricted shagreen, at least on VII and VIII. Median point patches on tergites IV-VI, on tergites IV and V obviously single; 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 or setae present on VI, if (rarely) all are reduced to setae, the most posterior is the most conspicuous; at least one lateral seta on segment VII, and all those on segment VIII taeniate.
Anal segment: Anal lobe ratio 1.7 (n=1). Anal lobes rounded apically, without teeth. Fringe of anal lobe with 22-25 taeniae; the three anal macrosetae situated apically on the anal lobes.

Note: Ps. brehmi appears to be no more than a small form of Psectrocladius sordidellus. There is overlap on pupal and adult characters. Springtime populations of small exuviae with few anal lobe taeniae will establish its identity as sordidellus at this time of year is at its largest, usually well in excess of 5mm long, with 34 or usually more taeniae on the anal lobes.

Species keys out at Page 678: Orthocladiinae 90 Psectrocladius of the Text Key.

(S)W Europe, north Africa.
(For more information see module IdentifyIt – file: Orthocladiinae).

Ecological notes
Stagnant water.