Euglena Vector Illustration

Euglena is a genus of single-celled organisms belonging to the kingdom Protista, specifically the phylum Euglenozoa. These organisms are characterized by their unique ability to photosynthesize like plants in the presence of light but also can behave heterotrophically, consuming organic matter like animals when light is not available. This dual mode of nutrition makes them mixotrophic. Euglena cells are typically elongated and spindle-shaped, with a whip-like tail called a flagellum that they use for movement. They are often green in color due to the presence of chloroplasts, which contain the pigment chlorophyll, allowing them to carry out photosynthesis. However, some species of Euglena lack chloroplasts and are colorless, relying entirely on heterotrophic nutrition.