Halobacteria are salt-tolerant archaea that live in high-salt environments such as the Dead Sea. They play an essential role in these ecosystems by decomposing dead brine shrimp and nourishing young brine shrimp and flies with their metabolic byproducts.

Halobacteria

Methanogens are unique Archaea belonging to classes such as Methanobacteria, Methanococci, and Methanomicrobia within the phylum Euryarchaeota that produce methane by reducing carbon dioxide in the presence of hydrogen.

Methanogens

Euryarchaeota is a phylum within the domain Archaea that includes diverse classes of halophilic and methanogenic organisms, such as Halobacteria and various methanogens.

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- Crenarchaeota
- Euryarchaeota
- Korarchaeota
- Nanoarchaeota
- Thaumarchaeota

Major Phylum of Archaea

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Crenarchaeota is a highly diverse class of aquatic Archaea that are thought to be the most abundant microorganisms in the oceans. Although they vary greatly in morphology and growth requirements, the majority of Crenarchaeota are hyperthermophiles, with some species, such as those in the genus Pyrolobus, capable of growing at temperatures up to $${}113$$ °C.

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