Fig. 2.

Algae across the eukaryotes. Presented is a tree of eukaryotes, based on data from reference 123, showing the six “supergroups.” For ease of visualization, the SAR clade has been split into its three constituent lineages (stramenopiles, alveolates, and rhizaria). Chromalveolate groups are shaded in orange. Photosynthetic phyla are shown in colored text to indicate the chloroplast lineage, as shown in the key. The majority have just one lineage, but for some (dinoflagellates and cercozoa) there are two or more. Nonphotosynthetic phyla that contain organelles believed to be derived from ancestral chloroplasts are in italics.