Archaea (; from Greek αρχαία, "old ones"; singular Archaeum, Archaean, or Archaeon), also called Archaebacteria (), is a major division of living organisms. Although there is still uncertainty in the exact phylogeny of the groups, Archaea, Eukaryota and Bacteria are the fundamental classifications in what is called the three-domain system. Like bacteria, Archaea are single-celled organisms lacking nuclei and are therefore classified as Prokaryota — known as Monera in the five-kingdom taxonomy. They were originally described in extreme environments, but have since been found in all types of habitats.

A single organism from this domain has been called an "archaean." Furthermore, this biologic term is also used as an adjective.

History

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Archaea were identified in 1977 by Carl Woese and George Fox based on their separation from other prokaryotes on 16S rRNA phylogenetic trees. These two groups were originally named the Archaebacteria and Eubacteria, treated as kingdoms or subkingdoms, which Woese and Fox termed Urkingdoms. Woese argued that they represented fundamentally different branches of living things. He later renamed the groups Archaea and Bacteria to emphasize this, and argued that together with Eukarya they comprise three Domains of living things.

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RT @xinca The First Genome for Bacteria And Archaea Goes Online Researchers have published the first volume of ‘Genomic http://url4.eu/14FUp
GarthGodsman (Garth Godsman) Thu, 07 Jan 2010 04:27:47 -0000
RT @xinca The First Genome for Bacteria And Archaea Goes Online Researchers have published the first volume of ‘Genomic http://url4.eu/14FUp
The First Genome for Bacteria And Archaea Goes Online: Researchers have published the first volume of ‘Genomic Encyclop http://url4.eu/14FUt
chowchun (Chun) Thu, 07 Jan 2010 04:15:31 -0000
The First Genome for Bacteria And Archaea Goes Online: Researchers have published the first volume of ‘Genomic Encyclop http://url4.eu/14FUt
The First Genome for Bacteria And Archaea Goes Online: Researchers have published the first volume of ‘Genomic Encyclop http://url4.eu/14FUr
energytalks (Energy Talks) Thu, 07 Jan 2010 04:15:30 -0000
The First Genome for Bacteria And Archaea Goes Online: Researchers have published the first volume of ‘Genomic Encyclop http://url4.eu/14FUr
The First Genome for Bacteria And Archaea Goes Online: Researchers have published the first volume of ‘Genomic Encyclop http://url4.eu/14FUp
xinca (XINCA Energy Control) Thu, 07 Jan 2010 04:15:29 -0000
The First Genome for Bacteria And Archaea Goes Online: Researchers have published the first volume of ‘Genomic Encyclop http://url4.eu/14FUp
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Archaea (Rick Cano) Thu, 07 Jan 2010 03:10:14 -0000
Modern Warfare. Anyone want to play #psn #ps3
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JMikeMcConville (J Michael McConville) Thu, 07 Jan 2010 01:07:34 -0000
What is so special about Evolv? Archaea Active...find out for yourselves! http://archaeaactive.com/ http://bit.ly/4NgljR

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