protozoan Any memeber of the phylum Protozoa, which comprises unicellular organisms found worldwide in marine or freshwater, free-living and as parasites. These microscopic animals have the ability to move (by cilia or pseudopodia) and have a nucleus, cytoplasm and cell wall; some contain chlorophyll. Reproduction is by fission or encystment. Length: 0.3mm (0.1in). The 30,000 species divide into four classes: Flagellata, Cnidospora, Ciliophora, and Sporozoa.
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