At a glance
Essentials
- Habitat
- It is widely found in nature and is common in freshwater habitats, especially in shallow eutrophic ponds.
- Activity
- It can swim and responds to light stimuli; under low light intensity conditions, it moves toward the light source, while at high intensities it may move away from it.
- Diet
- It can grow through photosynthesis, with light and CO₂, or heterotrophically in the dark if an organic carbon source is available; it can also combine photosynthesis with the use of organic carbon.
Observation guide
What to look for
- 01
It is unicellular and presents one or two flagella that emerge from a groove at the anterior end; generally, only one protrudes.
- 02
It has a flexible cell covering called a pellicle, formed by protein bands located under the plasma membrane.
- 03
Its chloroplasts allow photosynthesis, and near the base of the emerging flagellum it presents a pigmented spot associated with light responses.
Lighting, age and viewing angle can hide features. If identification affects consumption, handling or conservation, consult specialist sources.
Ecology
Description and characteristics
Euglena gracilis is a single-celled microscopic organism with flagella that allow it to move. It possesses chloroplasts and can perform photosynthesis; it can also grow heterotrophically, utilizing organic carbon. Its flexible cell surface allows shape changes, and its metabolism produces paramylon, a storage compound. Under dark cultivation conditions with oxygen, it can rely on organic substances from the environment instead of light.