What is the main feature to classify Euglena as a plantlike protist​

Euglena has chloroplasts that allows it to photosynthesize, and a primitive eye-spot which detects light in order for the cell to shift it's position to maximize its photosynthesis. Euglena does lack a cell wall, a defining feature of plant cells, instead having a pellicle made of protein bands to protect itself.

brave new world, aldous huxley (1932)