Phylogeny

While Cyanidiophyceae is universally agreed to be the most basal, the remaining 6 classes in the subphylum Rhodophytina have uncertain relationships. The below cladogram follows the results of a 2016 study concerning diversification times among red algae. Number of known extant species in parentheses.

Evolution

Red algal chloroplasts originated from an endosymbiotic

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