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Unformatted text preview: pellicle. They discharge long, barbed trichocysts for defense and for capturing prey; toxicysts release a poison. Ciliates are complex, heterotrophic protozoans that lack cell walls and use multiple small cilia for locomotion. To increase strength of the cell boundary, ciliates have a pellicle, a sort of tougher membrane that still allows them to change shape. Most of the 8000 species are freshwater. Most ciliates have two nuclei: a macronucleus that contains hundreds of copies of the genome and controls metabolisms, and a single small micronucleus that contains a single copy of the genome and functions in sexual reproduction. Paramecium is a common ciliate seen by students in introductory biology classes, and is shown in Figures 6 and 7....
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- Fall '10