Euglenoids are members of the kingdom Protista. They live in stagnant freshwater. They show mixotrophic nutrition i.e. autotrophic as well as heterotrophic nutrition. In the presence of sunlight, they are autotrophic (having photosynthetic pigments similar to higher plants) while in absence of sunlight they are heterotrophic and show predation. Dinoflagellates are mostly marine members.