[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 Sphingopyxis Takeuchi et al. 2001
               1 Sphingopyxis macrogoltabida (Takeuchi et al. 1993) Takeuchi et al. 2001
               2 Sphingopyxis alaskensis (Vancanneyt et al. 2001) Godoy et al. 2003
               3 Sphingopyxis baekryungensis Yoon et al. 2005
               4 Sphingopyxis taejonensis (Lee et al. 2001) Pal et al. 2006
               5 Sphingopyxis chilensis Godoy et al. 2003
               6 Sphingopyxis flavimaris Yoon and Oh 2005
               7 Sphingopyxis terrae (Takeuchi et al. 1993) Takeuchi et al. 2001
               8 Sphingopyxis witflariensis Kämpfer et al. 2002