Cell structure. Euglenophyceae. Euglenid. Euglenoids (or euglena) are one of the best-known groups of flagellates, commonly found in freshwater especially when it is rich in organic materials, with a few marine and endosymbiotic members.
Most euglenids are unicellular. Many euglenids have chloroplasts and produce energy through photosynthesis, but others feed by phagocytosis or strictly by diffusion. They belong to the phylum Euglenophyta, and their cell structure is typical of that group. Euglenoids are thought to descend from an ancestor that took up green algae by secondary endosymbiosis.[2] Structure and locomotion[edit]