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 Rhizobiales Kuykendall 2006] see Order Hyphomicrobiales Douglas 1957 (Approved Lists 1980) [Family Bradyrhizobiaceae Garrity et al. 2006] see Family Nitrobacteraceae corrig. Buchanan 1917 (Approved Lists 1980) [Genus Oligotropha Meyer et al. 1994 [monotypic]] see Genus Afipia Brenner et al. 1992 1 Oligotropha carboxidovoransᵀ (ex Meyer and Schlegel 1978) Meyer et al. 1994