Stentor roeseli, a transparent 'trumpet animalcule' that inhabits a gelatinous tube. Stentors use a row of fused cilia, the adoral zone of membranelles (AZM), to sweep in food particles.

Zoom in on the AZM of Stentor.

  
Part of the Collection of the Ciliate Centre of the Micropolitan Museum © Wim van Egmond