Ett rike inom domänen Archaea, omfattande termofila organismer från den heta källan Obsidian Pool i Yellowstone nationalpark, vilka tiullhör de mest primitiva livsformer som finns. De har genomgått en mycket liten evolutionsförändring.
A kingdom in the domain ARCHAEA, comprising thermophilic organisms from terrestrial hot springs that are among the most primitive of all life forms. They have undergone comparatively little evolutionary change since the last common ancestor of all extant life.
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