Unicellular
From EvoWiki
Unicellular refers to organisms consisting of only one cell. Historically, unicellular organisms were grouped in two taxa within the kingdoms of plants and animals, depending on whether they are capable of photosynthesis. But that division was not satisfying: those groups were polyphyletic. For example, the taxon Flagellata was split in Zooflagellata (flagellate animals) and Phytoflagellata (flagellate plants), dispersing even very close relatives into different kingdoms. The kingdom Protista (sometimes referred to as Protoctista), was created by Ernst Haeckel in 1866, so now unicellular organisms can be organized into three kingdoms:
The other kingdoms are descended from those, so they are still polyphyletic.
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