1. Mixotrophic: Euglenophytes are unique in that they can obtain energy through both photosynthesis and heterotrophy (consuming organic matter). This flexibility allows them to thrive in various environments, even when sunlight is limited.

2. Pellicle: Euglenophytes possess a flexible, proteinaceous layer called a pellicle beneath their cell membrane. This structure allows for rapid shape changes, enabling them to move quickly and efficiently through water.

3. Eyespot: Many euglenophytes have a red, light-sensitive organ called an eyespot. This structure helps them detect light, which aids in their photosynthetic process and allows them to move towards favorable light conditions.