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Issues related to evolution of algal chloroplasts are considered. The position of algae on the Tree of Life is discussed. Algae are now included in five of the monophyletic eukaryotic supergroups: Archaeplastida (Glaucocystophyta, Rhodophyta, Prasinodermophyta, Chlorophyta, and Charophyta), TSAR (Ochrophyta; Dinophyta; Chlorarachniophyta; and photosynthetic species of the genera
Chromera
,
Vetrella,
and
Paulinella
), Haptista (Prymnesiophyta and Rappemonads), Cryptista (Cryptophyta), and Discoba (Euglenophyta). The algal divisions and the respective supergroups are characterized in brief.