"Proteoarchaeota" are a proposed
archaea
Archaea ( ; singular archaeon ) is a domain of single-celled organisms. These microorganisms lack cell nuclei and are therefore prokaryotes. Archaea were initially classified as bacteria, receiving the name archaebacteria (in the Archaeba ...
l
kingdom thought to be closely related to the
Eukaryote
Eukaryotes () are organisms whose cells have a nucleus. All animals, plants, fungi, and many unicellular organisms, are Eukaryotes. They belong to the group of organisms Eukaryota or Eukarya, which is one of the three domains of life. Bacter ...
s.
[Approximately the same group is sometimes referred to as TACK after the initial letters of its early-found daughter clades: Thaumarchaeota (now Nitrososphaerota), "]Aigarchaeota
The "Aigarchaeota" are a proposed archaeal phylum of which the main representative is '' Caldiarchaeum subterraneum''.. It is not yet clear if this represents a new phylum or a and order of the Nitrososphaerota, since the genome of ''Caldiarchae ...
", Crenarchaeota (now Thermoproteota
The Thermoproteota (also known as crenarchaea) are archaea that have been classified as a phylum of the Archaea domain. Initially, the Thermoproteota were thought to be sulfur-dependent extremophiles but recent studies have identified characteris ...
), and "Korarchaeota
In taxonomy, the Korarchaeota are a phylum of the Archaea. The name is derived from the Greek noun koros or kore, meaning ''young man'' or ''young woman,'' and the Greek adjective archaios which means ''ancient.'' They are also known as Xenarchae ...
". Because of the unsettled phylogeny
A phylogenetic tree (also phylogeny or evolutionary tree Felsenstein J. (2004). ''Inferring Phylogenies'' Sinauer Associates: Sunderland, MA.) is a branching diagram or a tree showing the evolutionary relationships among various biological s ...
of the group, the names "Proteoarchaeota" and TACK may become distinct after further re-organization.
Classification
The phylogenetic relationship of this group is still under discussion. The relationship of the members is approximately as follows:
Notes
References
Archaea
Kingdoms (biology)
{{Archaea-stub