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Many legumes have root nodules that provide a home for symbiotic nitrogen-fixing bacteria called rhizobia. This relationship is particularly common in nitrogen-limited conditions. The Rhizobia convert nitrogen gas from the atmosphere into ammonia, which is then used in the formation of amino acids and nucleotides .
1 The plants are tiny single-celled algae, the zooxanthellae or symbiotic dinoflagellates, that live within the tissues of corals in great numbers.2  It is not known whether rugose corals had symbiotic photosymbiotic zooxanthellae as modern corals do. It is not known whether rugose corals had symbiotic photosymbiotic zooxanthellae as modern corals do. 2  The zooxanthellae in these corals are dinoflagellates, and it is suspected that there may be a relationship between their diversifications.