The organism described is a Euglenoid (e.g., Euglena). These organisms are characterized by a protein-rich layer called a pellicle instead of a cell wall, which provides their bodies with flexibility.

Euglenoids possess pigments (Chlorophyll a and b) that are identical to those found in higher plants.

They exhibit mixotrophic nutrition: they are photosynthetic in sunlight but act as heterotrophs by predating on smaller organisms in the dark.

They typically have two flagella of unequal length (one long and one short), a condition sometimes referred to as heterokont.

The characteristic of having a silicified and indestructible cell wall belongs to Diatoms (Chrysophytes), not Euglenoids.

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