prokaryotes - bacteria see Domain Bacteria Woese et al. 1990
   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 Methylophilales Garrity et al. 2006 [monotypic]
           Family Methylophilaceae Garrity et al. 2006
             1 Genus Methylobacillus Yordy and Weaver 1977 (Approved Lists 1980)
             2 Genus Methylophilus Jenkins et al. 1987
             3 Genus Methylovorus Govorukhina and Trotsenko 1991