Halobacteria is a class of halophilic archaea or bacteria that live in high salt conditions. They are also photosynthesizing bacteria. 

Halobacteria

Euryarchaeota contain many classes of Archaea many of which are methanogens which produce methane gases.

University of Wisconsin - Madison

- Crenarchaeota
- Euryarchaeota
- Korarchaeota
- Nanoarchaeota
- Thaumarchaeota

Major Phylum of Archaea

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Microbiology covers the scope and sequence requirements for a single-semester microbiology course for non-majors. The book presents the core concepts of microbiology with a focus on applications for careers in allied health. The pedagogical features of the text make the material interesting and accessible while maintaining the career-application focus and scientific rigor inherent in the subject matter. Microbiology’s art program enhances students’ understanding of concepts through clear and effective illustrations, diagrams, and photographs.

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Crenarchaeota are aquatic archaea that are highly abundant in the oceans and many can live in hot temperatures. 

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