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 Alphaproteobacteria Garrity et al. 2006
                   Order Sphingomonadales Yabuuchi and Kosako 2006
                     1 Genus "Kaistobacter" Bernard et al. 2007 nom. inval., incertae sedis
                     2 Family Erythrobacteraceae Lee et al. 2005
                     3 Family Govanellaceae Vandamme et al. 2026 [monotypic]
                     4 Family Sphingomonadaceaeᵀ Kosako et al. 2000
                     5 Family Sphingosinicellaceae Hördt et al. 2020
                     6 Family Zymomonadaceae Hördt et al. 2020 [monotypic]