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The chloroplasts were presumably acquired by ingesting some green alga. They are surrounded by four membranes, the outermost of which is continuous with the endoplasmic reticulum, and contain a small nucleomorph between the middle two, which is a remnant of the alga's nucleus. This contains a small amount of DNA and divides without forming a mitotic spindle. The origin of the chloroplasts from green algae is supported by their pigmentation, which includes chlorophylls a and b, and by genetic similarities. The only other group of algae that contain nucleomorphs are the cryptomonads, but their chloroplasts seem to be derived from a red algaFlorideophyceae Bangiophyceae Cyanidiophyceae The red algae are a large group of mostly multicellular, marine algae, including many notable seaweeds. Most of the coralline algae, which secrete calcium carbonate and play a major role in building reefs, bel.

The chlorarachniophytes only include four genera, which show some variation in their life-cycles and may lack one or two of the stages described above. They have mitochondriaIn cell biology, a mitochondrion is an organelle found in the cells of most eukaryotes. Mitochondria are sometimes described as " cellular power plants" because their primary purpose is to manufacture adenosine triphosphate (ATP), which is used as a sourc with tubular cristae. Genetic studies place them among the Cercozoa, a diverse group of amoeboid and amoeboid-like protozoa.