Diamesa hyperborea

Author: Holmgren, 1869

Diagnosis (n=1, material in coll. ZMBN)
Exuviae 5.0mm long.
Cephalothorax: Frontal setae 200µm long. Thoracic horn 360µm long; ThR 30. Precorneal setae 2,3: 235; 110µm long.
Abdomen: Hook row II absent. Teeth of abdominal segments golden; dorsal teeth 60µm long (031i.jpg). Total dorsal teeth 50. Total ventral teeth 69. Shagreen points on III 7µm long. Lateral seta 1 of segment III 125µm long.
Anal segment: Anal lobe ratio 1.3. Each anal lobe with 3 macrosetae, macrosetae 0.8x lobe length.

Species keys out at Page 564: Diamesinae 40 Diamesa of the Text Key.

Faeroes, Norway, Svalbard (Lindegaard, 1997a).
(For more information see module IdentifyIt – file: Other subfamilies).

Ecological notes
Northern, cold, usually running, water.