Domain Archaea
Previously the Archaebacteria.
The Archaea are unusual prokaryotes, with a morphology similar to the Eubacteria, but in biochemistry and molecular biology, they more closely resemble the eukaryotes. Probably more closely related to the eukaryotes than to the eubacteria.
Extremely heat and/or acid tolerant bacteria.
Extremely salt tolerant bacteria and the methanogenic bacteria that make you fart.
Functional, not evolutionary grouping.
Methane producing archaea.
Functional, not evolutionary grouping.
Extreme salt tolerant archaea.
Functional, not evolutionary grouping.
Extremophiles capable of growing at pH 2 and in boiling water.
Archaea only known from their DNA sequences: not yet cultured in the laboratory.
Endosymbiotic bacterium (Nanoarchaeum equitans), tentatively assigned to its own kingdom.