A kingdom or large grouping that comprises mostly single-celled organisms such as the protozoa, simple algae and fungi, slime molds, and (formerly) the bacteria. They are now divided among up to thirty phyla, and some have both plant and animal characteristics.‘This Kingdom does not contain the prokaryotes (Kingdom Monera, includes bacteria, blue-green algae) or the protists (Kingdom Protista, includes unicellular eukaryotic organisms).’
- ‘The scheme most often used currently divides all living organisms into five kingdoms: Monera, Protista, Fungi, Plantae, and Animalia.’
- ‘Intermittently, the Porifera were classified to the Protista / Protozoa.’
- ‘The biological kingdom Protista contains all those relatively simple organisms which consist of a single cell containing a nucleus and other internal structures.’
- ‘The second group includes proteins that appeared before radiation of Eukaryota to Viridiplantae, Metazoa, and Protista.’
Modern Latin (plural), from Greek prōtista, neuter plural of prōtistos ‘very first’, superlative of prōtos ‘first’.