Diamesa serratosioi

Author: Willassen, 1985

Diagnosis (n=1, material in coll. ZMBN)
Exuviae small, 3.2mm long.
Colour: pale yellow.
Cephalothorax: Frontal setae 100µm long. Thoracic horn 160µm long; ThR 10.7. Precorneal setae 1-3: 75; 60; 30µm long. Thorax smooth.
Abdomen: Rarely less than 7 teeth in tooth row of tergite II. Total dorsal teeth 58. Total ventral teeth 36. Shagreen 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); points of tergite III 5µm long. Lateral seta 1 of segment III 50µm long.
Anal segment: Anal lobe ratio 1.55. Each anal lobe with 3 lateral setae; length setae 0.7x lobe length.

Species keys out at Page 574: Diamesinae 50 Diamesa of the Text Key.

(For more information see module IdentifyIt – file: Other subfamilies).

Ecological notes
Glacial torrents, Norway.