Term describes the kingdom Protozoa as it is used in GFBio. It indicates a domain of organisms which comprises the single-celled microscopic animals, which include amoebas, flagellates, ciliates, sporozoans, and many other forms. They are now usually treated as a number of phyla belonging to the kingdom "Protista" (cf. https://en.oxforddictionaries.com/definition/protozoa and https://en.oxforddictionaries.com/definition/protista).