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Archaeoglobus

Ferroglobus

Ferroplasma

Halobacterium

Halococcus

Ignicoccus

Methanobacterium

Methanocaldococcus

Methanopyrus

         Methanospirillum

         Picrophilus

         Pyrococcus

         Pyrolobus

         Pyrodictium

         Staphylothermus

        Thermococcus

        Thermoplasma

        Thermoproteus