Infusoria
From MedBib.com - Medicine & Nature
Infusoria is an obsolete collective term for minute aquatic creatures like ciliates, euglenoids, protozoa, and unicellular algae that exist in freshwater ponds. In modern formal classifications the microorganisms previously included in the Infusoria are mostly assigned to the Kingdom Protista.
Aquarium use
Infusoria are used by owners of aquariums to feed fish fry; rasboras and bettas are just two examples which will require this food to survive the first few days. However there are usually not enough infusoria in the average aquarium tank to feed the newly hatched animals.
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.
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