The dinoflagellates are a large group of flagellate protists. About half are photosynthetic, the rest are mostly heterotroph predators of other protists. The ones which are photosynthetic are sometimes loosely called 'algae'; the one which are predators are sometimes loosely called 'protozoa'. They have been classified as an order, a class and a phylum by different authors. Active research is being done on their relationships. Most are marine plankton, but they are common in fresh water habitats as well. Their populations are distributed depending on temperature, salinity, or depth. The group includes many symbionts and bioluminescent species. About 1,555 species of free-living marine dinoflagellates are currently described. The latest estimates suggest a total of 2,294 living dinoflagellate species, which includes marine, freshwater and parasitic dinoflagellates.
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a) Dinoflagellates
The dinoflagellates are a large group of flagellate protists. About half are photosynthetic, the rest are mostly heterotroph predators of other protists. The ones which are photosynthetic are sometimes loosely called 'algae'; the one which are predators are sometimes loosely called 'protozoa'. They have been classified as an order, a class and a phylum by different authors. Active research is being done on their relationships. Most are marine plankton, but they are common in fresh water habitats as well. Their populations are distributed depending on temperature, salinity, or depth. The group includes many symbionts and bioluminescent species. About 1,555 species of free-living marine dinoflagellates are currently described. The latest estimates suggest a total of 2,294 living dinoflagellate species, which includes marine, freshwater and parasitic dinoflagellates.
sorry i know about this only i hope it helps a little bit