[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 Burkholderiales Garrity et al. 2006
           Family Alcaligenaceae De Ley et al. 1986
             Genus Alcaligenes Castellani and Chalmers 1919 (Approved Lists 1980)
               [Alcaligenes faecalis] Castellani and Chalmers 1919 (Approved Lists 1980)
                 Alcaligenes faecalis subsp. phenolicus Rehfuss and Urban 2006