Genome News Network: New Amino acid Discovered in Methanosarcina barkeri
- Reports on the discovery of a new amino acid, pyrrolysine, coded by UAG (normally a stop codon) in this methanogen.
- http://www.genomenewsnetwork.org/articles/05_02/amino_acid.shtml

Archaeal Diversity
- Online textbook chapter from the University of Wisconsin, discussing various species and touching on some of the molecular characteristics that separate them from other life forms.
- http://www.bact.wisc.edu/Microtextbook/index.php?name=Sections&req=listarticles&secid=10

BBC News: Toughest Bug Reveals Genetic Secrets
- Reports the decoding of the Pyrococcus abyssi, which lives in the intense pressure and temperature of black smoker vents on the seafloor.
- http://news.bbc.co.uk/1/hi/sci/tech/399972.stm

Wikispecies: Archaea
- Taxonomy browser, with some links.
- http://species.wikimedia.org/wiki/Archaea

Domain Archaea
- Systematic discussion of the various phyla within the Crenarchaea, Euryarchaeota, based on RNA differences.
- http://comenius.susqu.edu/bi/202/ARCHAEA/

German Jurgens: Molecular phylogeny of Archaea in boreal forest soil, freshwater and temperate estuarine sediment
- Academic thesis on the unexpected organisms discovered by ribosomal analysis of non-extreme soil and water samples.
- http://ethesis.helsinki.fi/julkaisut/maa/skemi/vk/jurgens/

Archaea
- Short, simple introduction to these organisms.
- http://www.microbe.org/microbes/archaea.asp

Distribution of Archaea in a Black Smoker Chimney Structure
- Analysis of different communities in varied microhabitats of a deep-sea vent. Journal article from Applied and Environmental Microbiology
- http://aem.asm.org/cgi/content/full/67/8/3618

The Archaea
- General introduction, mentioning most known genera and species of Euryarchaeota and Crenarchaeota. Includes some technical details such as toxin sensitivities.
- http://www.earthlife.net/prokaryotes/archaea.html

Open Questions: Archaea and Extremophiles
- Annotated list of recommended sources.
- http://www.openquestions.com/oq-bi002.htm

Horikoshi Superbugs
- Summary of interesting organisms discovered during a search for extremophiles, including a picture of the triangular halophile Haloarcula japonicus.
- http://www.jst.go.jp/erato/project/htkb_P/htkb_P.html

ARCHAIC (ARCHAebacterial Information Collection)
- Genome sequences of three Euryarchaeota species, Pyrococcus sp. OT3, Thermoplasma volcanium GSS1, and Archaeoglobus fulgidus, and related papers by the research group.
- http://www.aist.go.jp/RIODB/archaic/

Archaea (Archaebacteria)
- Taxonomy, description, and extensive references, with particular emphasis on the Crenarchaeota (classified here as a Kingdom.)
- http://tolweb.org/tree?group=Archaea&contgroup=Life

Life in Extreme Environments
- Links to information about thermophiles, halophiles, and other extremophiles both inside and outside of the domain Archaea.
- http://www.astrobiology.com/extreme.html

Taxonomy Browser (Archaea)
- Shows the relationships among the reconginzed groups, and samples yet to be named or classified.
- http://www3.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?name=Archaea

ArchaeaWeb
- Links to popular press and journal articles, research news, and other sources of information about Archaea and extremophiles. Includes user comments.
- http://www.archaea.unsw.edu.au/

Introduction to the Archaea
- Covers their main groupings, chemical differences from other life forms, fossil record, and the structure of their cell walls.
- http://www.ucmp.berkeley.edu/archaea/archaea.html