Brillia bifida

Author: (Kieffer, 1909)

Exuviae 4.9-6.4mm long (m=5.7mm, n=6) (038-2.jpg).
Cephalothorax: Thoracic horn large, emarginate apically, 345-445µm long (m=379µm, n=5) (038f.jpg). ThR 3.1, 4.0 (n=2).
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, VIII 5.
Anal segment: Anal lobe ratio 1.7-2.0 (n=5). Anal fringe of 37-43 taeniae (m=41, n=7) (038h.jpg).
(Linked adult male: Langton and Pinder, 2003a)

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

Palaearctic species: widespread in Europe, north Africa.
(For more information see module IdentifyIt – file: Orthocladiinae).

Ecological notes
Streams; occasionally lakes.