Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         Biota
           Domain Bacteria Woese et al. 1990
             Superphylum Terrabacteria Battistuzzi et al. 2004
               Phylum Firmicutes corrig. Gibbons and Murray 1978 (Approved Lists 1980)
                 Class Clostridia Rainey 2010
                   Order Clostridialesᵀ Prévot 1953 (Approved Lists 1980)
                     Family Clostridiaceaeᵀ Pribram 1933 (Approved Lists 1980)
                       Genus Clostridiumᵀ Prazmowski 1880 (Approved Lists 1980)
                         Clostridium histolyticum (Weinberg and Séguin 1916) Bergey et al. 1923 (Approved Lists 1980)