Psectrocladius calcaratus

Author: (Edwards, 1929)

Exuviae 4.9-5.5mm long (m=5.3mm, n=13) (048-1.jpg).
Cephalothorax: Thoracic horn 165-265µm long (m=226µm, n=12), small-toothed (048b.jpg); ThR 8.3-14.1 (m=10.6, n=11).
Abdomen: Tergites III-VIII with restricted shagreen, at least on VII and VIII, with conspicuous large points medially and/or posteriorly. Median point patches on tergites IV(V)-VII single, not forming transverse rows; points large, the longest greater than 35µm long, usually obviously exceeding the length of the longest tooth of the posterior transverse rows (048d.jpg). Three or four lateral setae on segments II-VI, not taeniate; lateral taeniae of segments VI-VIII: 1,4,5.
Anal segment: Anal lobe ratio 1.6-1.9 (m=1.7, n=12). Anal lobes drawn out apically into a toothed point (048e.jpg). Fringe of anal lobe with 28-33 taeniae (m=32, n=12). The three anal macrosetae situated apically on the anal lobes.
(Linked adult male: Langton and Pinder, 2003a)

Species keys out at Page 673: Orthocladiinae 85 Psectrocladius of the Text Key.

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

Ecological notes
Northern and montane lakes.