Chlamydomonas, Chlorella are present in Kingdom Protista as well as Plantae under division algae.

In which kingdom they correctly belong to?


It is generally accepted now that Chlorophyta are Plantae (see here). They are more closely related to plants than any other group of organism. Protist is a kind of basket term for any eukaryotic unicellular organism that is not an animal, fungi or a plant which is a rather exclusionary definition.

Personally, I think the kingdoms are pretty 'macro' oriented and do not really capture the diversity well of unicellular organisms. If you want to see a bunch of elderly scientist shout at each other over what appear to be arbitrary distinctions, I highly recommend attending the taxonomy session of any unicellular conference

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    $\begingroup$ What about Rhodophyta and Phaeophyta?? BTW Thnx;) $\endgroup$
    – San
    Mar 24 '17 at 11:22
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    $\begingroup$ The rhodophyta might be monophyletic with the green lineage (have a common ancestor) but the Phaeophyta are definitely distinct and they likely arose during a seperate endosymbiosis event. They just do not fit in the five kingdoms. algaebase.org is quite respected for questions of algae taxonomy $\endgroup$
    – mimat
    Mar 24 '17 at 11:51

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