Algae is a broad name for several photosynthetic eukaryotic groups, rather than one exclusive clade. The older name blue-green algae for cyanobacteria is misleading in a comparison of cellular organization: cyanobacteria are bacteria, with neither chloroplasts nor a cell nucleus.
Chromera velia is a photosynthetic alveolate closely related to apicomplexan lineages. Comparative evidence from it helps reconstruct photosynthetic ancestry without assuming that a modern parasite itself photosynthesizes.
A microalga is a microscopic algal organism. Eukaryotic microalgae and cyanobacteria have different compartment architectures, so their electron-export mechanisms cannot be assumed identical.
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