Domain Bacteria Woese et al. 1990
   Phylum Proteobacteria Garrity and Holt 2001 see Phylum Proteobacteria Garrity et al. 2005
     Class "Betaproteobacteria" Garrity et al. 2001 nom. ined. see Class Betaproteobacteria Garrity et al. 2006
       Order "Methylophilales" nom. inval. see Order Methylophilales Garrity et al. 2006
         Family "Methylophilaceae" nom. inval. see Family Methylophilaceae Garrity et al. 2006
           Genus Methylobacillus Yordy and Weaver 1977 (Approved Lists 1980)
           Genus Methylovorus Govorukhina and Trotsenko 1991
           1 Genus Methylophilus Jenkins et al. 1987