[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 Betaproteobacteria Garrity et al. 2006
         Order Burkholderiales Garrity et al. 2006
           Family Comamonadaceae Willems et al. 1991
             Genus Hydrogenophaga Willems et al. 1989
               1 Hydrogenophaga atypica Kämpfer et al. 2005
               2 Hydrogenophaga defluvii Kämpfer et al. 2005
               3 Hydrogenophaga flava (Niklewski 1910) Willems et al. 1989
               4 Hydrogenophaga intermedia Contzen et al. 2001
               5 Hydrogenophaga palleronii (Davis 1970) Willems et al. 1989
               6 Hydrogenophaga pseudoflava (Auling et al. 1978) Willems et al. 1989
               7 Hydrogenophaga taeniospiralis (Lalucat et al. 1982) Willems et al. 1989