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Phylum Sarcomastigophora: The phylum Sarcomastigophora belongs to the Protist kingdom and it includes many unicellular or colonial, autotrophic, or heterotrophic organisms. Phylum Sarcomastigophora includes many large number of ecologically important forms. They can be unicellular or colonial and also can be autotrophic or heterotrophic. They can be termed as umbrella forms of protozoans which make their movements by flagella numbering from one to many and pseudopods can also be seen as locomotive organs. Sarcomastigophorans include both free-livings forms and parasite protozoans. Cell size can be from 10 to 30 micrometers. Reproduction can be seen through intact division and all movements of chromosomes can be seen within the nucleus.
Phylum Sarcomastigophora again divided into sub phylum Mastigophora and Sarcodina.
Sub Phylum Mastigophora:
Sub phyllum Mastigophora also called as flagellates can have about 8,500 living species. Most known flagellates are of marine kind and mainly called as dinoflagellates which are an important part of the phytoplanktons. Their contribution can be significantly seen in the food sources of filter feeding zooplankton and benthic organisms.
Some of these dioflagellates are responsible for the sparks and bioluminiscence of the sea waters many times. Eg. Noctiluca sp.
Sub Phylum Sarcodina:
Sarcodian are also popularly known as amoeba are about 13,500 living species of the subphylum. Their locomotory organs are pseudopodia and some of the organisms can also be found with skeleton. We can mostly find two important sarcodines Foraminifera and Radiolaria.
Most of the Foraminiferans have calcareous tests and can be found mostly in plankton or benthos. Ooze found at the bottom of the ocean is formed by these deposits of calcareous tests which are deposited over millions of years.
Another important part of phytoplanktons are Radiolarians mainly found in warmer waters. These are also play the main role of the formation of ooze at the bottom of sea floor.