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What are the major subdivisions of the domain Archaea?
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Archaea
Archaea are found in a diverse range of extreme environments, including the salt deposits on the shores of the Dead Sea.
The domain Archaea consists of two major subdivisions, along with several other recognized or proposed lineages. These include:
- Crenarchaeota: A major subdivision containing organisms often found in high-temperature environments, such as hot springs and hydrothermal vents, as well as abundant ammonia-oxidizing organisms in soils and oceans.1
- Euryarchaeota: A major subdivision that includes methanogens, halophiles (salt-loving organisms), and various organisms found in hot environments and deep-sea sediments.1
In addition to these two primary groups, the domain includes:
- Korarchaeota: A minor, ancient lineage typically found in high-temperature environments.1
- Other proposed lineages: Scientists have also proposed additional subdivisions, including Nanoarchaeota—noted for their small cell and genome size—and Thaumarchaeota.1