[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Bacteria Woese et al. 1990
     Phylum "Proteobacteria" Garrity et al. 2005 see Superphylum Proteobacteria Craig et al. 2010
       Class Alphaproteobacteria Garrity et al. 2006
         Order Sphingomonadales Yabuuchi and Kosako 2006
           Family Sphingomonadaceae Kosako et al. 2000
             Genus Porphyrobacter Fuerst et al. 1993
               1 Porphyrobacter neustonensis Fuerst et al. 1993
               2 Porphyrobacter cryptus Rainey et al. 2003
               3 Porphyrobacter dokdonensis Yoon et al. 2006
               4 Porphyrobacter donghaensis Yoon et al. 2004
               5 Porphyrobacter sanguineus (ex Ahrens and Rheinheimer 1968) Hiraishi et al. 2002
               6 Porphyrobacter tepidarius Hanada et al. 1997