Two aquatic protists each possess two flagella. Organism X has one longitudinal and one transverse flagellum, whereas or
Dinoflagellates possess one longitudinal and one transverse flagellum. Euglenoids also possess two flagella, but these are described as one short and one long.
Ref: NCERT Class 11 Biology Chapter 2: Biological Classification Protista - Euglenoids Slime Moulds Protozoans