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However, the term 'microbenthos' fits better the bottom-inhabiting unicellular Protoctista.
The question of how many kingdoms should be recognized is unresolved, related to the heterogeneous membership of the Protoctista (Protista).
I agree that a resolution to the number of kingdoms (or domains) is indeed possible, and that sorting out the evolutionary relationships among members of tire Kingdom Protoctista will be an essential step in doing so.