The Korarchaeota are a group of Archaea known only from 16S rRNA gene sequences obtained from samples of high temperature hydrothermal environments. Analysis of their 16S rRNA gene sequences suggests that they are not a member of the main archaeal groups, Crenarchaeota and Euryarchaeota. However, it is possible that Korarchaeota do not actually form a separate group, but are simply organisms where the 16S rRNA genes have undergone rapid or unusual mutations. The metabolic processes of Korarchaeota, including how they generate energy and obtain carbon, are currently unknown. The genome of one Korarchaeota that was enriched from a mixed culture is now being sequenced (http://www.jgi.doe.gov/sequencing/why/CSP2006/korarchaeota.html). Scientific classification or biological classification is how biologists group and categorize extinct and living species of organisms. ... Phyla / Classes Phylum Crenarchaeota Phylum Euryarchaeota Halobacteria Methanobacteria Methanococci Methanopyri Archaeoglobi Thermoplasmata Thermococci Phylum Korarchaeota Phylum Nanoarchaeota Archaea (; from Greek αÏχαία, old ones; singular Archaeum, Archaean, or Archaeon), also called Archaebacteria (), is a major division of living organisms. ... Phyla / Classes Phylum Crenarchaeota Phylum Euryarchaeota Halobacteria Methanobacteria Methanococci Methanopyri Archaeoglobi Thermoplasmata Thermococci Phylum Korarchaeota Phylum Nanoarchaeota Archaea (; from Greek αÏχαία, old ones; singular Archaeum, Archaean, or Archaeon), also called Archaebacteria (), is a major division of living organisms. ... Phyla / Classes Phylum Crenarchaeota Phylum Euryarchaeota Halobacteria Methanobacteria Methanococci Methanopyri Archaeoglobi Thermoplasmata Thermococci Phylum Korarchaeota Phylum Nanoarchaeota Archaea (; from Greek αÏχαία, old ones; singular Archaeum, Archaean, or Archaeon), also called Archaebacteria (), is a major division of living organisms. ... A non-coding RNA (ncRNA) is any RNA molecule that functions without being translated into a protein. ... Orders Caldisphaerales Cenarchaeales Desulfurococcales Sulfolobales Thermoproteales The Crenarchaeota are a major group of Archaea, containing many extremely thermophilic and psychrophilic organisms. ... Classes Halobacteria Methanobacteria Methanococci Methanomicrobia Methanosarcinae Methanopyri Archaeoglobi Thermoplasmata Thermococci The Euryarchaeota are a major group of Archaea. ...
At the same time, the features of archaea generally resemble the features of eukaryotes and bacteria more than they do each other, suggesting that archaea may lie close to the root of the terrestrial tree of life (see life, origin).
Korarchaeota, in particular, have been singled out as the closest organisms yet found to the universal ancestor.
It may be that archaea, and other varieties of extremophiles, are commonly the first to colonize young planets and that as time goes by they retreat to those regions, such as hydrothermal vents and subsurface rocks, where primordial environments remain.
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