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 Sphingomonadales Yabuuchi and Kosako 2006
                     Family Erythrobacteraceae Lee et al. 2005
                       Genus Porphyrobacter Fuerst et al. 1993
                         1 Porphyrobacter neustonensisᵀ Fuerst et al. 1993
                         2 Porphyrobacter tepidarius Hanada et al. 1997
                         3 Porphyrobacter sanguineus (ex Ahrens and Rheinheimer 1968) Hiraishi et al. 2002
                         4 Porphyrobacter cryptus Rainey et al. 2003
                         5 Porphyrobacter donghaensis Yoon et al. 2004
                         6 Porphyrobacter dokdonensis Yoon et al. 2006
                         7 Porphyrobacter colymbi Furuhata et al. 2013