The ciliates are a group of protozoans characterized by the presence of hair-like organelles called cilia , which are identical in structure to eukaryotic flagella , but in general shorter and present in much larger numbers , with a different undulating pattern than flagella .
The ciliates are a group of protists characterized by the presence of hair-like organelles called cilia , which are identical in structure to flagella but typically shorter and present in much larger numbers with a different undulating pattern than flagella .