 | This article relies largely or entirely on a single source .(October 2021) |
| Tetrahymenidae | |
|---|---|
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| Tetrahymena thermophila | |
Scientific classification  | |
| Domain: | Eukaryota |
| Clade: | Diaphoretickes |
| Clade: | SAR |
| Clade: | Alveolata |
| Phylum: | Ciliophora |
| Class: | Oligohymenophorea |
| Order: | Hymenostomatida |
| Suborder: | Tetrahymenina |
| Family: | Tetrahymenidae |
A protist is any eukaryotic organism that is not an animal, plant, or fungus. The protists do not form a natural group, or clade, since they exclude certain eukaryotes with whom they share a common ancestor; but, like algae or invertebrates, the grouping is used for convenience. In some systems of biological classification, such as the popular five-kingdom scheme proposed by Robert Whittaker in 1969, the protists make up a kingdom called Protista, composed of "organisms which are unicellular or unicellular-colonial and which form no tissues". In the 21st century, the classification shifted toward a two-kingdom system of protists: Chromista and Protozoa.
Tetrahymena thermophila is a species of Ciliophora in the family Tetrahymenidae. It is a free living protozoa and occurs in fresh water.
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