Subclass Infusoria is a scientific term that refers to single-celled organisms that are commonly found in aquatic environments, such as ponds and lakes. Infusoria is a term used to describe a diverse group of microorganisms that can be classified into various subgroups or synonyms. Some of the synonyms of Subclass Infusoria include Ciliophora, Protozoa, and Zoomastigophora. Ciliophora, also known as ciliates, are characterized by the presence of hair-like structures called cilia. Protozoa refers to a group of unicellular organisms that have diverse characteristics and can be classified based on their morphology and genetic makeup. Finally, Zoomastigophora is a term used to describe flagellated protozoans that have tail-like structures called flagella.