Author: Goetghebuer, 1931
Diagnosis (n=1, material in coll. ZMBN)
Exuviae 4.1mm long.
Cephalothorax: Frontal setae 50µm long. Thoracic horn 190µm long; ThR 11.2. Precorneal setae 2,3: 140; 125µm long.
Abdomen: Tergites II-IV behind posterior tooth rows with a band of small points, and the posterior tooth row of segment I well-developed. Total dorsal teeth I-VIII 103. Total ventral teeth III-VIII 56. Abdominal tergites II-VI with few or no points posterior to the posterior median adhesion marks (031b.jpg). Shagreen points on tergite III 6µm long. Lateral margins of segments II-V strongly serrate. Relative length segments IX:VIII 0.7. Relative width segments IX:VIII 1.26. Segment VIII 2.2x as wide as long. Lateral seta 1 of segment III 40µm long.
Note: Pale brown; teeth brownish.
Anal segment: Anal lobe ratio 1.7. Each anal lobe with 3 macrosetae; length macrosetae 0.66x lobe length.
Species keys out at Page 561: Diamesinae 37 Diamesa of the Text Key.
Distribution
Holarctic species: Iceland, Fennoscandia and Alps.
(For more information see module IdentifyIt – file: Other subfamilies).
Ecological notes
Cold streams down to 55m asl in the far north, about 2,000m asl in the Alps.