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
                       01 Genus Aeriscardovia Simpson et al. 2004 [monotypic]
                       02 Genus Alloscardovia Huys et al. 2007
                       03 Genus Bifidobacteriumᵀ Orla-Jensen 1924 (Approved Lists 1980)
                       04 Genus Bombiscardovia Killer et al. 2014 [monotypic]
                       05 Genus Galliscardovia Pechar et al. 2017
                       06 Genus Gardnerella Greenwood and Pickett 1980 [monotypic]
                       07 Genus Neoscardovia García-Aljaro et al. 2015
                       08 Genus Parascardovia Jian and Dong 2002 [monotypic]
                       09 Genus Pseudoscardovia Killer et al. 2014
                       10 Genus Scardovia Jian and Dong 2002 [monotypic]
                       11 Genus "Candidatus Ancillula" Strassert et al. 2020
                       12 Genus "Candidatus Opitulatrix" Kästle Silva and Brune 2025 nom. pro-inval.
                       13 Genus "Candidatus Servula" Kästle Silva and Brune 2025 nom. pro-inval.