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Traditionally, Archaea only included its prokaryotic members, but this has since been found to be paraphyletic, as eukaryotes are now known to have evolved from archaea. Even though the domain Archaea cladistically includes eukaryotes, the term "archaea" (sg.: archaeon / ɑːr ˈ k iː ɒ n / ar-KEE-on, from the Greek "ἀρχαῖον", which ...
The three-domain system presumes that eukaryotes are more closely related to archaea than to Bacteria and are sister group to Archaea, thus, it treats them as separate domain. [29] As more new archaea were discovered in the early 2000s, this distinction became doubtful as eukaryotes became deeply nested within Archaea.
Methanococcus maripaludis is a species of methanogenic archaea found in marine environments, predominantly salt marshes. [1] M. maripaludis is a non-pathogenic, gram-negative, weakly motile, non-spore-forming, and strictly anaerobic mesophile. [2] It is classified as a chemolithoautotroph. [3]
Archaea were initially viewed as extremophiles living in harsh environments, such as the yellow archaea pictured here in a hot spring, but they have since been found in a much broader range of habitats. [91] The archaea (Greek for ancient [92]) constitute a domain and kingdom of single-celled microorganisms.
The Haloarchaea, and particularly the family Halobacteriaceae, are members of the domain Archaea, and comprise the majority of the prokaryotic population in hypersaline environments. [5] Currently, 15 recognised genera are in the family. [6]
Since the introduction of the domain Archaea by Carl Woese in 1977, [57] methanogens were for a prolonged period considered a monophyletic group, later named Euryarchaeota (super)phylum. However, intensive studies of various environments have proved that there are more and more non-methanogenic lineages among methanogenic ones.
The large majority of thermoacidophiles are archaea (particularly the Thermoproteota and "Euryarchaeota") or bacteria, though occasional eukaryotic examples have been reported. [2] [3] Thermoacidophiles can be found in hot springs and solfataric environments, within deep sea vents, or in other environments of geothermal activity.
Halobacteriaceae is a family in the order Halobacteriales and the domain Archaea. [1] Halobacteriaceae represent a large part of halophilic Archaea, along with members in two other methanogenic families, Methanosarcinaceae and Methanocalculaceae. [2] The family consists of many diverse genera that can survive extreme environmental niches. [3]