Archezoa

Archezoa was a kingdom proposed by Thomas Cavalier-Smith[1][2] in the 20th century that was abandoned[3] after scientific understanding became more advanced. In Cavalier-Smith's system of classification, Archezoa contained some eukaryotes.

An early, incomplete classification system

Cavalier-Smith's system was developed before the presence and function of mitochondria in life forms was well-codified into taxonomic systems. As the understanding of the functions of mitochondria became more advanced, phylogeny of these life forms became more nuanced.

At various times, a few life forms were included in Archezoa. Two groupings of protists- Pelobionts and entamoebids (now Archamoebae)- were included. Metamonads, and the Microsporidia (both currently unranked within the Eukaryota domain) were included. These groups appear near the base of eukaryotic evolution on rRNA trees. Today, all these groups are known to have developed from mitochondriate ancestors, and trees based on other genes do not support their basal placement.

References
  1. Tom Cavalier-Smith (May 1989). "Archaebacteria and Archezoa". Nature. 339 (6220): 100–101. Bibcode:1989Natur.339..100C. doi:10.1038/339100a0. PMID 2497352.
  2. Tom Cavalier-Smith (December 1993). "Kingdom protozoa and its 18 phyla". Microbiological Reviews. 57 (4): 953–994. doi:10.1128/mmbr.57.4.953-994.1993. PMC 372943. PMID 8302218.
  3. Poole, Anthony; Penny, David (21 June 2007). "Engulfed by speculation" (PDF). Nature. 447 (7147): 913. doi:10.1038/447913a. PMID 17581566. Archived from the original (PDF) on 6 July 2011. Retrieved 15 March 2011.
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