Brillia flavifrons

Author: (Johannsen, 1905)

Diagnosis (n=5)
Exuviae 5.7-7.1mm long.
Cephalothorax: Thoracic horn small, 135-170µm long (n=4), narrowed apically to a pointed tip (038i.jpg). ThR 5.4-8.5.
Abdomen: Tergite II with a short postero-median band of dark, sturdy hooks, two or three rows deep (038g.jpg). Segments III-V with small points more or less covering the tergites, the posterior points in each segment a little stronger (038-2.jpg). Conjunctives III/IV-V/VI armed with an extensive band of points similar in form to those on the tergites. No lateral taeniae on segments III-VI; lateral taeniae of segment VII 4(2), VIII 5.
Anal segment: Anal lobe ratio 1.6-1.7. Anal fringe of 59-72 taeniae (n=5).
(Linked adult male: Langton and Pinder, 2003a)

Species keys out at Page 619: Orthocladiinae 31 Brillia of the Text Key.

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

Ecological notes
Streams; occasionally lakes.