I found this Darbyshirella species in a sample from a freshwater aquarium. This sample was send to me by Wolfgang Bettighofer. I kept some wet preparations in my humidity chamber. After about ten weeks I found several specimens of this Darbishirella species attached to the cover glass, while some cells could be observed inside filamentous blue algae. Obviously these cells were consuming the content of the algae. In and outside these algae a number of double walled cysts were observed. These cysts were mostly circular or elongated, sometimes irregular in outline.