Infusoria is a collective term for minute aquatic creatures like ciliates, euglenoids, protozoa, and unicellular algae that exist in freshwater ponds. In modern formal classifications the term is considered obsolete; and the microorganisms previously included in the Infusoria are mostly assigned to the Kingdom Protista. 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 Me… (More on Infusoria)