What makes euglenoids different than most other plantlike protists.

Euglenoids are actually both! They are protists and belong to the protist kingdom. Euglenoids are photosynthetic, like plants, and have no cell wall, like animals. Their for if you need an answer its Plant-like and animals.It doesn' have a cell wall because it is "plant-like," not a plant, 
it has a pellicle that provides strength and flexibility since it lacks a cell wall