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 Propionibacteriales (Rainey et al. 1997) Patrick and McDowell 2015
                     Family Propionibacteriaceaeᵀ Delwiche 1957 (Approved Lists 1980)
                       Genus Propionibacteriumᵀ Orla-Jensen 1909 (Approved Lists 1980)
                         01 Propionibacterium acidipropionici corrig. Orla-Jensen 1909 (Approved Lists 1980)
                         02 Propionibacterium acnes (sic) (Gilchrist 1900) Douglas and Gunter 1946 (Approved Lists 1980)
                         03 Propionibacterium australiense Bernard et al. 2002
                         04 Propionibacterium avidum (Eggerth 1935) Moore and Holdeman 1969 (Approved Lists 1980)
                         05 Propionibacterium cyclohexanicum Kusano et al. 1997
                         06 Propionibacterium freudenreichii van Niel 1928 (Approved Lists 1980)
                         07 Propionibacterium granulosum (Prévot 1938) Moore and Holdeman 1970 (Approved Lists 1980)
                         08 Propionibacterium jensenii van Niel 1928 (Approved Lists 1980)
                         09 Propionibacterium microaerophilum Koussémon et al. 2001
                         10 Propionibacterium propionicum corrig. (Buchanan and Pine 1962) Charfreitag et al. 1988
                         11 Propionibacterium thoenii van Niel 1928 (Approved Lists 1980)