thumb | right | alt=An illustration of various creature in a water drop | Illustration of a water drop from stagnant water Infusoria is a word used to describe various freshwater microorganisms, including ciliates, copepods, euglenoids, planktonic crustaceans, protozoa, unicellular algae and small invertebrates. Some authors (e.g., Bütschli) have used the term as a synonym for Ciliophora. In modern, formal classifications, the term is considered obsolete; the microorganisms previously and colloquially referred to as Infusoria are mostly assigned to the kingdom Protista.
thumb | right | alt=An illustration of various creature in a water drop | Illustration of .a water drop from stagnant water Infusoria is a word used to describe various freshwater microorganisms, including ciliates, copepods, euglenoids, planktonic crustaceans, protozoa, unicellular algae and small invertebrates. Some authors (eg., Bütschli) have used the term as a synonym for Ciliophora. In modern formal classifications the term i,s considered obsolete; th,e microorganisms previously and colloquially referred to as Infusoria are mostly assigned to the kingdom Protista.