Natura - nature actualia - actual entities Mundus Plinius - physical world naturalia - natural bodies Biota Domain Bacteria Woese et al. 1990 Superphylum "Proteobacteria" Craig et al. 2010 Phylum "Alphaproteobacteria" [monotypic] Class Alphaproteobacteriaᵀ Garrity et al. 2006 Order Rhizobiales Kuykendall 2006 Genus Methyloceanibacter Takeuchi et al. 2014, incertae sedis [monotypic] Family Roseiarcaceae Kulichevskaya et al. 2014 [monotypic] 01 Genus Amorphus Zeevi Ben Yosef et al. 2008, incertae sedis 02 Genus Vasilyevaea Yee et al. 2010, incertae sedis 03 Family Rhizobiaceaeᵀ Conn 1938 (Approved Lists 1980) 04 Family "Aurantimonadaceae" 05 Family Bartonellaceae Gieszczykiewicz 1939 (Approved Lists 1980) [monotypic] 06 Family Brucellaceae Breed et al. 1957 (Approved Lists 1980) 07 Family Phyllobacteriaceae Mergaert and Swings 2006 08.1 Genus Alsobacter Bao et al. 2014, incertae sedis [monotypic] 08.2 Family Methylocystaceae Bowman 2006 08.3 Family Beijerinckiaceae Garrity et al. 2006 09 Family Bradyrhizobiaceae Garrity et al. 2006 10.1 Genus Bauldia Yee et al. 2010, incertae sedis 10.2 Family Hyphomicrobiaceae Babudieri 1950 (Approved Lists 1980) 10.3 Family Xanthobacteraceae Lee et al. 2005 11 Family Methylobacteriaceae Garrity et al. 2006 12 Family Rhodobiaceae Garrity et al. 2006 13 Family Cohaesibacteraceae Hwang and Cho 2008 [monotypic]