prokaryotes - bacteria see Domain Bacteria Woese et al. 1990
   Domain "Archaea" Woese et al. 1990
     Phylum "Euryarchaeota" Garrity and Holt 2001
       Class Methanopyri Garrity and Holt 2002 [monotypic]
         1 Order Methanopyrales Huber and Stetter 2002 [monotypic]