Phaenopsectra pe-forma-bala

Form described by Langton, 1984

Exuviae 6.6-7.5mm long (n=9).
Cephalothorax: Cephalic tubercles more or less cylindrical, truncate (usually less than 50µm long) and capped with fine spinules (often inverted in mounts) (120f.jpg , 120k.jpg); apex width 55-80µm (n=6). Frontal setae 60µm long (n=1). Thoracic horn with 6-10 branches, branches much shorter than half the length of the abdomen. Thorax with a short patch of conspicuously large granules near suture, which may be extended along the suture as a narrow band (112b.jpg).
Abdomen: Length hook row II 0.48-0.56x width tergite (n=3); hooks 79-92 (n=6). Tergites II-VI with obvious anterior transverse bands of points stronger than those of the median patch with which they may be confluent for the tergite width. The median point patch of tergite VI is reduced in the density of points, evanescent medially or totally (120j.jpg). Usually both segments III and IV with an apical band of points; sometimes only IV. Conjunctives with a black mark laterally. Vortex present. Lateral taeniae of segments V-VIII: 3,3,4,4.
Anal segment: Fringe of anal lobe with 36-51 taeniae (n=9).

Form keys out at Page 293: Chironomini 190 Phaenopsectra of the Text Key.

W Europe.
(For more information see module IdentifyIt – file: Chironominae).

Ecological notes
Montane lakes and streams.