Eukaryotes

 Prokaryotes

   Bacteria

   Archaea

     Euryarchaeota

     Crenarchaeota

       Aeropyrum

       Staphylothermus

       Ignicoccus

       Desulfurococcus

       Thermosphaera

       Ignisphaera

       Thermogladius

       Hyperthermus

       Pyrolobus

       Pyrodictium

       Sulfurisphaera

       Saccharolobus

       Sulfolobus

       Metallosphaera

       Acidianus

       Sulfodiicoccus

       Stygiolobus

       Sulfuracidifex

       Pyrobaculum

       Caldivirga

       Thermoproteus

       Vulcanisaeta

       Thermofilum

       Acidilobus

       Caldisphaera

       Fervidicoccus

     Thaumarchaeota

     Nanoarchaeota

     Candidatus Micrarchaeota

     Candidatus Korarchaeota

     Candidatus Bathyarchaeota

     Asgard group

     unclassified Archaea