procaryotes
   Domain Bacteria Woese et al. 1990
     Phylum Deferribacteres Garrity and Holt 2001
       Class Deferribacteres Huber and Stetter 2001 nom. inval. see Class Deferribacteres Huber and Stetter 2002
         Order Deferribacterales Huber and Stetter 2001 nom. inval. see Order Deferribacterales Huber and Stetter 2002
           Family Deferribacteraceae Huber and Stetter 2001 nom. inval. see Family Deferribacteraceae Huber and Stetter 2002
             ?Genus Synergistes Allison et al. 1993