Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Domain Bacteria Woese et al. 2024
             Kingdom Pseudomonadati (Gibbons and Murray 1978) Oren and Göker 2024
               Phylum Pseudomonadotaᵀ Garrity et al. 2021
                 Class Betaproteobacteria Garrity et al. 2006
                   Order Rhodocyclales Garrity et al. 2006
                     Family Azonexaceae Boden et al. 2017
                       Genus Quatrionicoccus Tindall and Euzéby 2006 [monotypic]
                         1 Quatrionicoccus australiensisᵀ (Maszenan et al. 2002) Tindall and Euzéby 2006