the infusoria

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polygastrica
mastigopoda
microzoa
monadaria
infusoria
the many minute aquatic creatures, such as protozoa and unicellular algae found in fresh water habitats
infusoria
in some recent classifications, coextensive with the Ciliata: minute organisms found in decomposing infusions of organic matter
infusoria
One of the classes of Protozoa, including a large number of species, all of minute size