prokaryotes - bacteria see Domain Bacteria Woese et al. 1990
   Domain "Bacteria" Woese et al. 1990
     Phylum "Verrucomicrobia" Hedlund 2011
       Class Opitutae Choo et al. 2007
         1 Order Opitutales Choo et al. 2007 [monotypic]
         2 Order Puniceicoccales Choo et al. 2007 [monotypic]