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 Bacillotaᵀ Gibbons and Murray 2021
                 Class Clostridia Rainey 2010
                   Order Peptostreptococcales Chuvochina et al. 2024
                     Family Peptostreptococcaceaeᵀ Ezaki 2010
                       Genus Peptostreptococcusᵀ Kluyver and van Niel 1936 (Approved Lists 1980)
                         Peptostreptococcus anaerobiusᵀ (Natvig 1905) Kluyver and van Niel 1936 (Approved Lists 1980)