The shape of Euglena resembles an elongated or spindle-shaped cell that is 15 to 500 micrometers, or 0.0006 to 0.02 inches, in length. Some species can change their shape as they lack a rigid cellulose wall, and instead have a flexible pellicle.
Euglena are single-celled organisms that have both plant and animal characteristics. They are unicellular, photosynthetic green protists, that are sometimes referred to as algae. Euglena are motile with a single flagellum. They can be found in freshwater habitats and polluted waters where organic matter exists. Euglena absorb their food either through the cell or they produce it via photosynthesis.