[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Bacteria Woese et al. 1990 stat. inval. see Domain Bacteria Woese et al. 2024
     Phylum "Proteobacteria" Garrity et al. 2005 stat. inval. see Phylum Pseudomonadota Garrity et al. 2021
       Class Betaproteobacteria Garrity et al. 2006
         Order Methylophilales Garrity et al. 2006 see Order Spirillales Prévot 1940 (Approved Lists 1980)
           Family Methylophilaceae Garrity et al. 2006
             Genus Methylophilus Jenkins et al. 1987
               1 Methylophilus methylotrophus Jenkins et al. 1987
               2 Methylophilus leisingeri corrig. Doronina and Trotsenko 2001