[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 "Actinobacteria" Garrity and Holt 2001 see Phylum Actinobacteria Goodfellow 2012 nom. inval.
       Class "Actinobacteria" Stackebrandt et al. 1997 nom. illeg. see Class Actinomycetes Krassilnikov 1949 (Approved Lists 1980)
         Subclass Actinobacteridae Stackebrandt et al. 1997 see Class Actinobacteria Stackebrandt et al. 1997 nom. illeg.
           Order Bifidobacteriales Stackebrandt et al. 1997
             Family Bifidobacteriaceae Stackebrandt et al. 1997
               Genus Bifidobacterium Orla-Jensen 1924 (Approved Lists 1980)
                 [Bifidobacterium animalis] (Mitsuoka 1969) Scardovi and Trovatelli 1974 (Approved Lists 1980)
                   1 Bifidobacterium animalis subsp. animalisᵀ (Mitsuoka 1969) Masco et al. 2004
                   2 Bifidobacterium animalis subsp. lactis (Meile et al. 1997) Masco et al. 2004