prokaryotes - bacteria see Domain Bacteria Woese et al. 1990
   Domain "Bacteria" Woese et al. 1990
     Phylum "Verrucomicrobia" Hedlund 2011
       Class Verrucomicrobiae Hedlund et al. 1998 [monotypic]
         Order Verrucomicrobiales Ward-Rainey et al. 1996
           Family Verrucomicrobiaceae Ward-Rainey et al. 1996
             Genus Prosthecobacter (ex Staley et al. 1976) Staley et al. 1980