Chilodonella protozoa. Light micrograph of several Chilodonella sp. ciliate protozoa. Chilodonella is a single-celled animal that is found in freshwater. Like all ciliates, it is covered in cilia, short hair-like appendages. These are beaten rhythmically to propel the protozoan through the water, and also to waft food particles into its insmouthins. Magnification: x320 when printed 10cm high.