eukaryotic clade comprising opisthokonts, Breviatea, and apousomonads

Obazoa is a clade (a group of plants or animals that share an ancestor). It is a Unikont. Unikonts are one of the five superkingdoms in the classification of eukaryotes.

Temporal range: Late Stenian - Present, 1031.4–0 Ma
Scientific classification Edit this classification
Domain: Eukaryota
Clade: Amorphea
Clade: Obazoa
Brown, 2013

The Obazoa is made up of Breviatea, Apusomonadida and Opisthokonta. It does not include Amoebozoa, because that is a different clade. The connections between opisthokonts, breviates and apusomonads are not well known yet. Probably the Breviatea are the most basic of the three groups.[1][2][3] RNA phylogenies (evolution clues) do not give much evidence that Obazoa is a clade.[4] This could still mean Obazoa is from a very old ancestor, and there are not many clues left (because of its age).


  1. Eme, Laura; Sharpe, Susan C.; Brown, Matthew W.; Roger, Andrew J. (2014). "On the Age of Eukaryotes: Evaluating Evidence from Fossils and Molecular Clocks". Cold Spring Harbor Perspectives in Biology. 6 (8): a016139. doi:10.1101/cshperspect.a016139. ISSN 1943-0264. PMC 4107988. PMID 25085908.
  2. Ruggiero, Michael A.; Gordon, Dennis P.; Orrell, Thomas M.; Bailly, Nicolas; Bourgoin, Thierry; Brusca, Richard C.; Cavalier-Smith, Thomas; Guiry, Michael D.; Kirk, Paul M. (2015-06-11). "Correction: A Higher Level Classification of All Living Organisms". PLOS ONE. 10 (6): e0130114. Bibcode:2015PLoSO..1030114R. doi:10.1371/journal.pone.0130114. ISSN 1932-6203. PMC 5159126. PMID 26068874.
  3. Cavalier-Smith, Thomas; Fiore-Donno, Anna Maria; Chao, Ema; Kudryavtsev, Alexander; Berney, Cédric; Snell, Elizabeth A.; Lewis, Rhodri (2015-02-01). "Multigene phylogeny resolves deep branching of Amoebozoa". Molecular Phylogenetics and Evolution. 83: 293–304. doi:10.1016/j.ympev.2014.08.011. PMID 25150787.
  4. Orr, Russell J. S.; Zhao, Sen; Klaveness, Dag; Yabuki, Akinori; Ikeda, Keiji; Makoto, Watanabe M.; Shalchian-Tabrizi, Kamran (2017-10-08). "Enigmatic Diphyllatea eukaryotes: Culturing and targeted PacBio RS amplicon sequencing reveals a higher order taxonomic diversity and global distribution". BMC Evolutionary Biology. 18 (1): 115. doi:10.1186/s12862-018-1224-z. PMC 6052632. PMID 30021531.