: Sida crystallina.

Sida crystallina is the largest littoral cladoceran in Norwegian lakes and also one of the most common. It has a rectangular form and seem to be very tolerant toward differences in environmental conditions.

Sida crystallina O.F.M.
Creative Commons Attribution | Bjørn Walseng | Norsk institutt for naturforskning
Kart. Utbredelse i Norge.