organisms that may share a unique common ancestor that established an endosymbiotic association with a cyanobacterium. The relationship among the three groups remains uncertain, although it is most likely that glaucophytes diverged first:

The alternative, that glaucophytes and red algae form a clade, has been shown to be less plausible, but cannot be ruled out.

Internal

The internal phylogeny of the glaucophytes and the number of genera and

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