Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         [crown] Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Domain Bacteria Woese et al. 1990 [paraphyletic?]
             Superphylum "Proteobacteria" Craig et al. 2010
               Phylum "Alphaproteobacteria" Garrity et al., 2006 [monotypic]
                 Class Alphaproteobacteriaᵀ Garrity et al. 2006
                   Order Rhodobacterales Garrity et al. 2006 [monotypic]
                     Family Rhodobacteraceaeᵀ Garrity et al. 2006
                       Genus Ruegeria Uchino et al. 1999
                         1 Ruegeria atlantica (Rüger and Höfle 1992) Uchino et al. 1999
                         2 Ruegeria mobilis Muramatsu et al. 2007
                         3 Ruegeria pelagia Lee et al. 2007
                         4.1 Ruegeria lacuscaerulensis (Petursdottir and Kristjansson 1999) Yi et al. 2007
                         4.2 Ruegeria pomeroyi (González et al. 2003) Yi et al. 2007