Euglenoids are unicellular microorganisms having a flexible body.
It possesses a pellicle.
Euglena either absorb organic compounds from the surrounding water or engulf bacteria and protists by phagocytosis within the food vacuoles as gullets.
They have plastids and can perform photosynthesis in light, but move around in search of food using their flagellum in the absence of light.
They have the ability to move using Myonemes.
Since they show both autotrophic and heterotrophic(saprotrophic) modes of nutrition, they are known as mixotrophic.
Osmoregulation is achieved by contracting the contractile vacuole.