Write the characteristic feature of group Dinoflagellates. 

Explanation

Habitat: These organisms are mostly marine and photosynthetic.
Body organisation : They appear yellow, green, brown, blue or red depending on the main pigments present in their cells.
The cell wall has stiff cellulose plates on the outer surface.
Most of them have two flagella, one lies longitudinally and the other transversely in a furrow between the wall plates.
Special features : Very often red dinoflagellates (Example : Gonyaulax) undergo such rapid multiplication that they make the sea appear red (red tides).
Toxins released by such large numbers may even kill other marine animals such as fishes.
Reproduction : Dinoflagellates reproduce asexually through cell division or by the formation of zoospores and cysts.
Reserve food : Reserve food is stored in the from of starch and oils. e.g. Gonyaulax, Ceratium, Noctiluco, Peridinium and Gymnodinium etc.