Author: Goetghebuer, 1932
Diagnosis (n=3, unless stated otherwise)
Exuviae 6.0-6.3mm long.
Cephalothorax: Frontal setae 185-220µm long. Precorneal setae 2,3: 195-230, 100-110µm long. Thoracic horn 345-487µm long; ThR 18-31.
Abdomen: Hook row II absent. Total dorsal teeth II-VIII 39-48. Total ventral teeth III-VII/VIII 47-64+. Shagreen points of tergite III 6µm long. Relative length segments IX:VIII:VII = 1.0:0.64-0.67:0.83-0.95 (n=2); relative width segments IX:VIII:VII = 1.0:1.2-1.3:1.4-1.5 (n=2). Segment VIII 2.6, 2.7 and segment VII 2.1-2.4 times as wide as long (n=2). Lateral setae 1-4 of segment III 150-163; 150-163; -- 125-160; 65-100µm long (031d.jpg).
Anal segment: Anal lobe ratio 1.4-1.5 (n=2). Each anal lobe with 3 macrosetae; length macrosetae 0.7-0.76x lobe length (n=2).
See note under Diamesa pe2
(Linked adult male: Langton and Pinder, 2003a)
Species keys out at Page 571: Diamesinae 47 Diamesa of the Text Key.
Distribution
Holarctic species: Widespread in Europe (not Mediterranean).
(For more information see module IdentifyIt – file: Other subfamilies).
Ecological notes
Cold running water.