with symbiotic algae

Description:

Vorticella (vort-ee-sell-a) the iconic peritrich ciliate. The feeding cells in sessile peritrich ciliates have lost all of the somatic cilia and only have the feeding cilia. The feeding cilia form a wreath which extends around the front of the cell and descends into a narrowing buccal cavity. The stalk contains a contractile filament, and when this contracts it coils up a bit like a spring. This species with endosymbiotic algae. Phase contrast.