KEY PRIMARILY TO FAMILIES OF THE CILIOPHORA 



Cilia distributed uniformly, except at the 

 anterior or posterior ends of the cell, or at 

 the vestibulum or buccal cavity. Cilia in 

 rows. Cytostome present or absent 



Cilia reduced in number, 

 often nonuniform in dis- 

 tribution, leaving noncil- 

 iated surfaces. Cyto- 

 stome present or absent. 



54 



Cilia completely absent; no cytostome 112 



2 (1) 



2 U) 



Cilia all simple, not 

 forming compound, 

 membranous, or syn- 

 chronous units. (Note: 

 membranellelike 

 groups of cilia occur 

 on the general cell 

 surface of the ciliates 

 Placus socialis, Proro- 

 don mimeticus, and 

 member of the Family 

 NASSULIDAE) 



Compound cilia present as cirri, undulating 

 membranes, peniculi, or membranelles, func- 

 tioning synchronously, in feeding and/or 

 locomotion 



29 



