According to Biological classification Class 11 notes, the majority of Euglenoids are freshwater creatures that live in stagnant water. They contain a protein-rich layer called a pellicle instead of a cell wall, which allows them to bend their bodies.

They have two flagella, one that is short and the other that is long. When they are exposed to sunlight, they are photosynthetic, but when they are not, they behave like heterotrophs, predating on other smaller species. Euglenoids have pigments that are nearly identical to those found in higher plants