Following biologist played their role in the formation of Kingdom Protista:
He proposed the kingdom Protoctista for microscopic organisms in 1861.
He suggested for creating the kingdom Protista in 1866. He included in this kingdom bacteria and all other microorganisms which did not fit in plant and animal kingdom like amoeba. However, he separated the blue green algae and bacteria (prokaryotes) from the nucleated protists. He placed them in a separate group called Monera, within the kingdom Protista.
He separated the prokaryotes from the Protista and raised the prokaryotes (Monera) to the status of kingdom in 1938.
He formed five kingdom systems in 1969. He placed only unicellular eukaryotes in Protista.
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They modified the five kingdom system in 1982. They also included colonial and simple multicellular eukaryotes in Kingdom Protista. Now kingdom protista have all unicellular, colonial and simple multicellular organisms. Protists or Protoctista is one the five kingdoms.
Evolution has produced diversity in the Protista. They show diversity in following characters:
Due to this diversity most biologists take protists as polyphyletic group of organisms. The protists do not have single common ancestor. Margulis and Schwartz have formed 27 phyla of all the diverse organisms of the Protista.
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Protista has following four major groups:
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