plantenrijk Haeckel (1866) - plants
   [Division] Protophyta Sachs 1874 - primitive plants
     Class Schizomycetes Nägeli 1857 (Approved Lists 1980) - bacteria and related forms
       Order Eubacteriales Buchanan 1917 (Approved Lists 1980) see Order Clostridiales Prévot 1953 (Approved Lists 1980)
         Family Bacillaceae Fischer 1895 (Approved Lists 1980)
           Genus Clostridium Prazmowski 1880 (Approved Lists 1980)
             Clostridium tetani (Flügge 1886) Bergey et al. 1923 (Approved Lists 1980)