formerly classified as an eukaryote supergroup now as a megagroup including most photosynthetic eukaryotes
(Redirected from Chromalveolata)

Chromalveolata is a eukaryote supergroup first proposed by Thomas Cavalier-Smith as a refinement of his kingdom Chromista, which was first proposed in 1981.

Chromista collage 2.jpg
Clockwise from top-left: a haptophyte, some diatoms, an oomycete, a cryptomonad, and Macrocystis, a phaeophyte
Scientific classification
Cavalier-Smith 1998

The origin of the Chromalveolata was thought to be a secondary endosymbiosis between a bikont (cell with two flagella) and a red alga.[1] This union led to plastids containing chlorophyll c. In Cavalier-Smith's classification, the Chromalveolata was one of the six major groups within the eukaryotes.[2]

The classification has been challenged.[3][4]


  1. Keeling P.J. (2009). "Chromalveolates and the evolution of plastids by secondary endosymbiosis". J. Eukaryot. Microbiol. 56: 1–8. doi:10.1111/j.1550-7408.2008.00371.x. PMID 19335769.
  2. Adl, Sina M. & al (2005). "The new higher level classification of eukaryotes with emphasis on the taxonomy of protists". Journal of Eukaryotic Microbiology. 52. p. 399. doi:10.1111/j.1550-7408.2005.00053.x.
  3. Burki, Fabien; Shalchian-Tabrizi, Kamran & Pawlowski, Jan (2008), "Phylogenomics reveals a new 'megagroup' including most photosynthetic eukaryotes", Biology Letters, 4: 366–369, doi:10.1098/rsbl.2008.0224
  4. Kim, E; Graham, LE (Jul 2008). "EEF2 analysis challenges the monophyly of Archaeplastida and Chromalveolata" (Free full text). PLoS ONE. 3 (7): e2621. doi:10.1371/journal.pone.0002621. PMC 2440802. PMID 18612431.CS1 maint: multiple names: authors list (link)