Diamesa vaillanti

Author: Serra-Tosio, 1972

Diagnosis (Material in coll. Serra-Tosio)
Exuviae 6.0-8.9mm long (n=10).
Colour: Golden exuviae, the anterior and posterior adhesion marks and base of tooth rows golden-yellow; conjunctives colourless. Teeth of abdominal tergites dark brown set on swollen golden mounds.
Cephalothorax: Frontal setae 200-313µm long (n=6). Thoracic horn 425-663µm long (n=7); ThR 21-31 (n=6). Precorneal setae 2,3: 220-400; 137-300µm long (n=7).
Abdomen: Total dorsal teeth II-VIII 42+-61+ (n=5); about 7 teeth in tooth row of tergite II. Total ventral teeth III-VIII 52+-101+ (n=5). Reticulation detectable in the antero-lateral corners of segments II-VII, evanescent or absent elsewhere. Points of tergites III-VII spreading posteriorly outside the anterior adhesion marks, extending the point patch towards the postero-lateral corner, progressively more extensive on succeeding segments (031d.jpg). Shagreen points of tergite III 8µm long. Tooth row of tergite VII followed by a rough band of small points. Relative length segments IX:VIII:VII = 1.0:0.6-0.8:0.8-1.1 (n=5); relative width segments IX:VIII:VII = 1.0:1.2-1.4:1.5-1.7 (n=5). Segment VIII 2.3-2.8 and segment VII 2.0-2.5 times as long as wide (n=5). Lateral setae 1-4 of segment III 100-230; 160-250; -- 120-225; 100-200µm long (n=5).
Anal segment: Anal lobe ratio 1.3-1.6 (n=5). Each anal lobe with 3 macrosetae; length macrosetae 0.6-0.8x lobe length (n=5).

Species keys out at Page 571: Diamesinae 47 Diamesa of the Text Key.

Central European and NW African alpine regions.
(For more information see module IdentifyIt – file: Other subfamilies).

Ecological notes
Running water.