Potthastia longimana

Author: (Kieffer, 1922)

Exuviae 4.7-6.1mm long (m=5.5mm, n=10).
Cephalothorax: Frontal setae 117-170µm long (n=3). Thoracic horn absent. Precorneal setae 1-3: 75-78; 100-130; 100-150µm long (n=3).
Abdomen: Hook row II absent. Apical transverse point bands present on segments III-VII(VIII), the apical transverse point bands separated from the posterior band by a point-free space (028e.jpg). Points of the posterior transverse bands smaller than those of the apical bands. Most of the lateral abdominal setae simple. Anterior dorsocentral seta usually simple, rarely bifid.
Anal segment: Anal lobes posterior to three marginal setae with a short, broad triangular projection, usually armed with small points or scales (028g.jpg ; 028h.jpg).
(Linked adult male: Langton and Pinder, 2003a)

Species keys out at Page 546: Diamesinae 22 Potthastia of the Text Key.

Holarctic species: Widespread in Europe.
(For more information see module IdentifyIt – file: Other subfamilies).

Ecological notes
Northern and montane lakes; rivers and streams generally.