Mesodinium rubrum

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In protozoan: Ecological and industrial importance of protozoans
…endosymbiotic algae, and one species, Mesodinium rubrum, has formed such a successful relationship with its red-pigmented algal symbiont that it has lost the ability to feed and relies entirely on symbiosis for its livelihood. Mesodinium often forms dense red blooms, or red tides, when it reaches high densities in water.…
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