prokaryotes - bacteria see Domain Bacteria Woese et al. 1990
   Domain "Bacteria" Woese et al. 1990
     Phylum "Deferribacteres" Garrity and Holt 2001 [monotypic]
       Class Deferribacteres Huber and Stetter 2002 [monotypic]
         Order Deferribacterales Huber and Stetter 2002
           1 Family Deferribacteraceae Huber and Stetter 2002
           2 Genus Caldithrix Miroshnichenko et al. 2003, incertae sedis