Differentiate between Dinoflagellates and Euglenoids.

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DinoflagellatesEuglenoids
$(1)$ They are mostly marine.$(1)$ They are freshwater forms found in stagnant water.
$(2)$ They have a cell wall with stiff cellulose plates on the outer surface.$(2)$ They lack a cell wall but possess a protein-rich layer called pellicle,which makes their body flexible.
$(3)$ They are typically photoautotrophic.$(3)$ They are photoautotrophic in the presence of sunlight but behave as heterotrophs when deprived of sunlight.
$(4)$ They have two flagella: one lies transversely and the other longitudinally.$(4)$ They have two flagella,both of which are located at the anterior end.

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