English: Plastid evolution in photosynthetic eukaryotes. The uptake of a cyanobacterium resulted in a photosynthetic plantae ancestor which subsequently diverged in the three lineages containing primary plastids: the chlorophytes (including the land plants), the rhodophytes, and the glaucophytes. The subsequent secondary endosymbioses of green and red algae engulfed by different hosts resulted in the euglenophyta and chlorarachniophyta (greens) and in the possibly monophyletic chromalveolates (reds). Paulinella chromatophora represents an independent primary endosymbiosis in progress.