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Infusoria is a collective term for minute aquatic creatures like ciliates, euglena, paramecia, protozoa and unicellular algae that exist in freshwater pond water. However, in formal classification microorganism called infusoria belongs to Kingdom Protista.
Aquarium use
Infusoria is used by owners of aquariums to feed fish fry; gourami fry and tadpoles are just two examples which will require this food to survive the first few days. However there is usually not enough infusoria in the average aquarium tank to feed the newly hatched animals. To make infusoria, you take a handful of hay or dry leaves and place it into a jar, fill the jar with water from your tank or a pool of water. Leave in the sun for a few days. When the water just starts to get cloudy the infusoria has sufficient bacteria to feed upon. Once the water begins to clear again, an appropriate culture is available. You can then extract these creatures, with a turkey baster, for example, for feeding to your fry.
Myonemes
In Infusoria and some Flagellates, the differentiated threads of ectosarc, which are contractile and doubly refractive, perform the function of muscular fibres in the Metazoa.
External links
"Infusoria"