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In the taxonomy
Alpha taxonomy is the discipline concerned with finding, describing and naming species of living or fossil organisms. This field is supported by institutions holding collections of these organisms, with relevant data, carefully curated: such institutes include natural history museums, herbaria and...
A microorganism or microbe is a microscopic organism that comprises either a single cell , cell clusters, or no cell at all...
s, the Euryarchaeota
(Greek for "broad old quality") are a phylum of the Archaea
The Archaea are a group of single-celled microorganisms. A single individual or species from this domain is called an archaeon...
include the methanogen
Methanogens are microorganisms that produce methane as a metabolic byproduct in anoxic conditions. They are classified as archaea, a group quite distinct from bacteria...
s, which produce methane and are often found in intestines, the halobacteria
In taxonomy, the Halobacteria are a class of the Euryarchaeota, found in water saturated or nearly saturated with salt. They are also called halophiles, though this name is also used for other organisms which live in somewhat less concentrated salt water...
, which survive extreme concentrations of salt, and some extremely thermophilic aerobes and anaerobes. They are separated from the other archaeans based mainly on rRNA sequences.