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taxon links [down<--]Archaea Interpreting the tree
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This tree diagram shows the relationships between several groups of organisms.

The root of the current tree connects the organisms featured in this tree to their containing group and the rest of the Tree of Life. The basal branching point in the tree represents the ancestor of the other groups in the tree. This ancestor diversified over time into several descendent subgroups, which are represented as internal nodes and terminal taxa to the right.

example of a tree diagram

You can click on the root to travel down the Tree of Life all the way to the root of all Life, and you can click on the names of descendent subgroups to travel up the Tree of Life all the way to individual species.

For more information on ToL tree formatting, please see Interpreting the Tree or Classification. To learn more about phylogenetic trees, please visit our Phylogenetic Biology pages.

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Containing group: Archaea


Barns, S. M., R. E. Fundyga, M. W. Jeffries and N. R. Pace. 1994. Remarkable archaeal diversity detected in a Yellowstone National Park hot spring environment. Proceedings of the National Academy of Sciences of the United States of America 91(5): 1609-1613.

Benachenhou, L. N., P. Forterre and B. Labedan. 1993. Evolution of glutamate dehydrogenase genes: Evidence for two paralogous protein families and unusual branching patterns of the archaebacteria in the universal tree of life. Journal Of Molecular Evolution 36(4): 335-346.

Briones, C. and R. Amils. 2000. Nucleotide sequence of the 23S rRNA from Haloferax mediterranei and phylogenetic analysis of halophilic archaea based on LSU rRNA. Systematic and Applied Microbiology 23:124-131.

Delong, E. F. 1992. Archaea in coastal marine environments. Proceedings of The National Academy of Sciences (U.S.A.), 89(12): 5685-5689.

Kjems, J., N. Larsen, J. Z. Dalgaard, R. A. Garrett and K. O. Stetter. 1992. Phylogenetic relationships amongst the hyperthermophilic Archaea determined from partial 23S rRNA gene sequences. Systematic and Applied Microbiology 15(2): 203-208.

Klenk, H. P., C. Schleper, V. Schwass and R. Brudler. 1993. Nucleotide sequence, transcription and phylogeny of the gene encoding the superoxide dismutase of Sulfolobus acidocaldarius. Biochimica Et Biophysica Acta 1174(1): 95-98.

About This Page

Correspondence regarding this page should be directed to Gary J. Olsen at

All Rights Reserved.

Citing this page:

Tree of Life Web Project. 1995. Euryarchaeota. Version 01 January 1995 (temporary). http://tolweb.org/Euryarchaeota/10/1995.01.01 in The Tree of Life Web Project, http://tolweb.org/

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This page is a Tree of Life Branch Page.

Each ToL branch page provides a synopsis of the characteristics of a group of organisms representing a branch of the Tree of Life. The major distinction between a branch and a leaf of the Tree of Life is that each branch can be further subdivided into descendent branches, that is, subgroups representing distinct genetic lineages.

For a more detailed explanation of the different ToL page types, have a look at the Structure of the Tree of Life page.

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