[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Bacteria Woese et al. 1990 stat. inval. see Domain Bacteria Woese et al. 2024
     Phylum "Proteobacteria" Garrity et al. 2005 stat. inval. see Phylum Pseudomonadota Garrity et al. 2021
       Class Betaproteobacteria Garrity et al. 2006
         Order Rhodocyclales Garrity et al. 2006
           Family Rhodocyclaceae Garrity et al. 2006
             Genus Quatrionicoccus Tindall and Euzéby 2006
               1 Quatrionicoccus australiensis (Maszenan et al. 2002) Tindall and Euzéby 2006