Author: Kieffer, 1908
Diagnosis (n=7, unless stated otherwise)
Exuviae 5.6-8.1mm long.
Cephalothorax: Frontal setae 125-140µm long (n=3). Thoracic horn 385-510µm long (n=6); ThR 18-34. Precorneal setae 2,3: 200; 150µm long (n=1). (030g.jpg)
Abdomen: Hook row II absent. Teeth of abdominal segments brown tipped (030h.jpg). Total dorsal teeth II-VIII 48-79. Total ventral teeth III-VII/VIII 45-86. Shagreen points of tergite III 10µm long. Relative length segments IX:VIII:VII = 1.0:0.61-0.78:0.83-1.1 (n=5); relative width segments IX:VIII:VII = 1.0:1.22-1.46:1.44-1.78 (n=4). Segment VIII 2.4-2.9 and segment VII 2.1-2.4 times as wide as long (n=5). Lateral setae 1-4 of segment III 95-143; 100-143; -- 110-140; 95-115µm long (n=4).
Note: Golden-tan; tergites darker than paratergites, smudged or suffused with pale brown, this colour spreading forwards of the brown anterior transverse apodemes, and particularly intense in the antero-lateral corners of the tergites; posterior part of tergites more or less suffused with gold; teeth (100µm long) gold, brown tipped.
Anal segment: Anal lobe ratio 1.4-1.6 (n=6). Each anal lobe with 3 macrosetae; length macrosetae 0.6-0.76x lobe length (n=4).
(Linked adult male: Langton and Pinder, 2003a)
Species keys out at Page 564: Diamesinae 40 Diamesa of the Text Key.
Distribution
Holarctic species: Widespread in Europe, also NW Africa.
(For more information see module IdentifyIt – file: Other subfamilies).
Ecological notes
Montane streams and lakes.