Vorticella infusionum (photo Dr. Marina Ettl)

Sessile ciliates

  • 30 – 60 µm
  • single-celled and with muscle
  • mouth opening clearly smaller than cell diameter
  • horseshoe-shaped macronucleus, parallel to mouth area

 

In activated sludge:

  • with oxygen concentration 1 – 2 mg/l