: Diacyclops nanus.

Diacyclops nanus is widely distributed in Norway, and because it is most common in acid water, it is used as an indicator of acidity. It is small, having a relatively long tail, and with the lateral seta attached close to the middle of the tail.

Diacyclops nanus Sars
Creative Commons Attribution | Bjørn Walseng | Norsk institutt for naturforskning
Kart. Utbredelse i Norge.