Ciliates (Fig. 11-3) are protozoa that have shorter hair-like structures called cilia that are found in rows on the outer surface of the cell. These cilia are used to move the protozoa through the environment and are used to bring food into the cell.

An example of a ciliate is Balantidium coli. It is the only ciliate that causes disease in humans. When ingested, it enters the large intestine, causing severe dysentery.

Fig. 11-3. Ciliates are protozoa that have cilia.
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