Editing Archezoa (section)

== Archezoa ''sensu'' Cavalier-Smith (1987) ==
Cavalier-Smith proposed the term 'Archezoa' for a paraphyletic (see [[Paraphyly]]) territory of [[eukaryotes]]  that primitively lacked mitochondria.  Like Margulis and others before (see [[Pelomyxa]]), Cavalier-Smith argued that the initial ancestor of eukaryotes emerged prior to the endosymbiotic acquisition (see [[endosymbiosis]]) of mitochondria.<ref name=Cavalier-Smith-1987>{{cite journal |last=Cavalier-Smith |first=T. |date=1987 |title=Eukaryotes with no mitochondria |journal=Nature |volume=326|issue=6111 |pages=332–333 |doi=10.1038/326332a0 |pmid=3561476 |bibcode=1987Natur.326..332C |s2cid=4351363 |issn=1476-4687 |url=https://www.nature.com/articles/326332a0 |lang=en|url-access=subscription }}</ref> The same paraphyletic territory was referred to as 'Hypochondria' by others.<ref>{{cite journal|pmid=16754614 |date=2006 |last1=Embley |first1=T. M. |title=Multiple secondary origins of the anaerobic lifestyle in eukaryotes |journal=Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences |volume=361 |issue=1470 |pages=1055–1067 |doi=10.1098/rstb.2006.1844 |pmc=1578728 }}</ref> The argument for Archezoa sensu Cavalier-Smith was never universally accepted because of conflicting information, and was dropped when the contrary argument, that amitochondriates were descendants of eukaryotes with mitochondria, became dominant. 

Eukaryotes that eventually acquired a bacterial endosymbiont that became the mitochondria were placed in a taxonomic group which Cavalier-Smith called the Metakaryota, whereas the Archezoa represented an earlier [[paraphyletic]] group to which Cavalier-Smith variously assigned the diplomonads, ''Entamoeba'', [[Microsporidia]], oxymonads, parabasalids ([[Parabasalid|Parabasalids]]), pelobionts (see ''[[Pelomyxa]]''), retortamonads, trichomonads, and ''Trimastix''<ref>{{cite journal |last1=Gray |first1=Michael W. |last2=Burger |first2=Gertraud |last3=Lang |first3=B. Franz |date=1999-03-05 |title=Mitochondrial evolution |journal=Science |volume=283 |issue=5407 |pages=1476–1481 |doi=10.1126/science.283.5407.1476 |pmid=10066161 |pmc=3428767 |bibcode=1999Sci...283.1476G |issn=0036-8075 |lang=en}}</ref> (see [[Cavalier-Smith's system of classification]]). With the rejection of 'Archeozoa', the meaning of the term 'Metakaryota' became the same as 'Eukaryota' (see [[Eukaryote]]), and Metakaryota became superfluous.