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Red algae are, not surprisingly, red, reddish or purplish in color. There are about 6,000 species of red algae (Source: AlgaeBase), and they are protists in the phylum Rhodophyta. Red algae species range from simple one-celled organisms to complex, multi-celled, plant-like organisms. Red algae get their energy from photosynthesis. One thing that distinguishes red algae from other algae is that their cells lack flagella.<br> see also : [[Seaweed]]