| Dinoflagellates | Euglenoids |
|---|---|
| $(1)$ 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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