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Thaumarchaeota
Scientific classification
Domain:	Archaea;
Kingdom:	incertae sedis; (or Crenarchaeota);
Phylum:	Thaumarchaeota;
Order
	Nitrosopumilales; Cenarchaeales; Nitrosocaldales;

In taxonomy, the Thaumarchaeota are a newly-proposed phylum of the Archaea. It contains two orders: the Nitrosopumilales and the Cenarchaeales.^[1] These organisms are mesophilic and may play important roles in biogeochemical cycles, such as the nitrogen cycle.

The phylum was proposed based on phylogenetic data, such as the sequences of these organisms' ribosomal RNA genes, and the presence of a form of type I topoisomerase that was previously thought to be unique to the eukaryotes.^[1]^[2]

[edit] References

^ ^a ^b Brochier-Armanet C, Boussau B, Gribaldo S, Forterre P (March 2008). "Mesophilic Crenarchaeota: proposal for a third archaeal phylum, the Thaumarchaeota". Nat. Rev. Microbiol. 6 (3): 245–52. doi:10.1038/nrmicro1852. PMID 18274537.
^ Brochier-Armanet C, Gribaldo S, Forterre P (2008). "A DNA topoisomerase IB in Thaumarchaeota testifies for the presence of this enzyme in the last common ancestor of Archaea and Eucarya". Biol. Direct 3: 54. doi:10.1186/1745-6150-3-54. PMID 19105819. PMC 2621148. http://www.biology-direct.com/content/3//54.

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