plantenrijk Haeckel (1866) - plants
   [Division] Protophyta Sachs 1874 - primitive plants
     Class Schizomycetes Nägeli 1857 (Approved Lists 1980) - bacteria and related forms
       Order Spirochaetales Buchanan 1917 (Approved Lists 1980)
         Family Treponemataceae Robinson 1948 (Approved Lists 1980)
           1 Genus Leptospira Noguchi 1917 (Approved Lists 1980)
           2 Genus Treponema Schaudinn 1905 (Approved Lists 1980)