Diamesa pe5

new form

Diagnosis (n=1, Coll. B. Lods-Crozet)
Exuviae 4.0mm long.
Cephalothorax: Thoracic horn present. Three precorneal setae, at least on one side. Thorax granulate.
Abdomen: Hook row II absent. Armament of tergite II well-developed, dense points extending at least for half the width of the tergite and posteriorly at least as far as the anterior adhesion marks. At least abdominal segments IV-VIII dorsally and ventrally with a single row of teeth posteriorly; VI and VII dorsally each with 4-10 teeth; dorsal teeth brown, best developed dorsal teeth narrow-triangular (031e.jpg). Segment VIII up to 3x as broad as long; segment VII less than 1.5x the length of segment VIII. Lateral setae of segments II-VII long, e.g. 1st lateral seta of segment III over 100µm long.
Anal segment: Each anal lobe with 3 macrosetae, setae at least partially hooked apically, at least half the anal lobe length.

Form keys out at Page 579: Diamesinae 55 Diamesa of the Text Key.

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

Ecological notes
Alpine stream.