Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Domain Bacteria Woese et al. 2024
             Kingdom Bacillatiᵀ (Gibbons and Murray 1978) Oren and Göker 2024
               Phylum Actinomycetota Goodfellow 2021
                 Class Actinomycetesᵀ Krassilnikov 1949 (Approved Lists 1980)
                   Order Bifidobacteriales Stackebrandt et al. 1997 [monotypic]
                     Family Bifidobacteriaceaeᵀ Stackebrandt et al. 1997
                       Genus Bifidobacteriumᵀ Orla-Jensen 1924 (Approved Lists 1980)
                         Bifidobacterium merycicum Biavati and Mattarelli 1991