Eukaryotes (541)

 Prokaryotes (6109)

   Bacteria (5783)

   Archaea (326)

     Euryarchaeota (226)

     Crenarchaeota (71)

     Thaumarchaeota (18)

       Nitrosopumilus (6)

       Nitrosomarinus (1)

       Cenarchaeum (1)

       Nitrososphaera (3)

       Nitrosocosmicus (2)

       Nitrosocaldus (1)

       Caldiarchaeum (1)

       Nitrosopelagicus (1)

       Nitrosotenuis (1)

       Nitrosotalea (1)

     Korarchaeota (1)

     Bathyarchaeota (2)

     Geothermarchaeota (1)

     Nanoarchaeota (2)

     Micrarchaeota (1)

     Lokiarchaeota (2)

     unclassified Archaea (2)