An euglena belongs to the Kingdom Protista. Protists are a diverse group of eukaryotic organisms that do not fit into the plant, animal, or fungi kingdoms. Euglenas are single-celled organisms that can be both autotrophic and heterotrophic.
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the Kingdom Protista, and the PhylumEuglenophyta
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Euglena is a genus. So Euglena has (or includes) species. Remember the order? Domain, Kingdom, ...... genus, species.