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Through Kingdom (taxonomy), Japan and China
Classification
- "Augarchaeota". It is a phylum proposed from the genome of the candidate species "Candidiatus Caldiarchaeum subterraneum" (now belongs to Thermoproteota as "Candidiatus Caldarchaeum subterraneum") found deep within a gold mine in Japan. Genomic sequences of this group have also been found in geothermal environments, both terrestrial and marine.
- Thermoproteota (formerly "Crenarchaeota"). It is the best-known edge and the most abundant archaea in the marine ecosystem. They were previously called sulfobacteria because of their dependence on sulfur and are important as carbon fixers. There are hyperthermophiles in hydrothermal vents and other groups are the most abundant at depths of less than 100 m.
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Phylogeny
The relationships are roughly as follows:
Eocyte hypothesis
The eocyte hypothesis proposed in the 1980s by James Lake suggests that eukaryotes emerged within the prokaryotic eocytes.
One piece of evidence supporting a close relationship between Thermoproteati and eukaryotes is the presence of a homolog of the RNA polymerase subunit Rbp-8 in Thermoproteota but not in "Euryarchaea".
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