Euglena gracilis

Species of single-celled organism

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Euglena gracilis
Kingdom:
Phylum:	Euglenozoa
Class:	Euglenoidea
Order:	Euglenales
Family:	Euglenaceae

Euglena gracilis is a species of single-celled flagellate eukaryote belonging to the genus Euglena. It is commonly found in freshwater environments and is known for its ability to exhibit both autotrophic and heterotrophic modes of nutrition.

Morphology

Euglena gracilis is characterized by its elongated, spindle-shaped body, which can range from 20 to 100 micrometers in length. The cell is covered by a flexible pellicle, allowing it to change shape. It possesses a single, whip-like flagellum that emerges from a reservoir at the anterior end, used for locomotion.

The cell contains numerous chloroplasts, which enable it to perform photosynthesis. These chloroplasts contain the pigment chlorophyll, giving the organism its green color. In the absence of light, Euglena gracilis can absorb nutrients directly from the environment, demonstrating its mixotrophic nature.

Reproduction

Euglena gracilis primarily reproduces asexually through binary fission. During this process, the cell elongates and divides longitudinally, resulting in two genetically identical daughter cells. Sexual reproduction has not been observed in this species.

Habitat

Euglena gracilis is commonly found in freshwater environments such as ponds, ditches, and slow-moving streams. It thrives in nutrient-rich waters and can often be seen forming green scums on the surface of stagnant water bodies.

Significance

Euglena gracilis is of interest in various fields of research due to its unique metabolic capabilities. It is used as a model organism in studies of photosynthesis, cell motility, and environmental stress responses. Additionally, its ability to produce paramylon, a storage carbohydrate, has potential applications in biotechnology.

See also

• Euglena
• Flagellate
• Photosynthesis
• Mixotroph
• Binary fission