prokaryotes - bacteria see Domain Bacteria Woese et al. 1990
   Domain "Bacteria" Woese et al. 1990
     Phylum "Fibrobacteres" Garrity and Holt 2012
       Class Fibrobacteria Spain et al. 2012 [monotypic]
         Order Fibrobacterales Spain et al. 2012 [monotypic]
           Family Fibrobacteraceae Spain et al. 2012 [monotypic]
             1 Genus Fibrobacter Montgomery et al. 1988