Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         [crown] Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Domain Bacteria Woese et al. 1990 [paraphyletic?]
             Superphylum Terrabacteria Battistuzzi et al. 2004
               Phylum "Actinobacteria" Garrity and Holt 2001
                 Class Actinobacteriaᵀ Stackebrandt et al. 1997
                   Order Bifidobacteriales Stackebrandt et al. 1997 [monotypic]
                     Family Bifidobacteriaceae Stackebrandt et al. 1997
                       Genus Bifidobacteriumᵀ Orla-Jensen 1924 (Approved Lists 1980)
                         Bifidobacterium thermophilum corrig. Mitsuoka 1969 (Approved Lists 1980)