[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Bacteria Woese et al. 1990
     Phylum "Proteobacteria" Garrity et al. 2005 see Superphylum Proteobacteria Craig et al. 2010
       Class Betaproteobacteria Garrity et al. 2006
         Order "Procabacteriales" Garrity et al., 2003
           Family "Procabacteriaceae" Garrity et al., 2003
             Genus "Procabacter" Horn et al. 2002
               Procabacter acanthamoebae Horn et al. 2002