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 Spirochaetaceae Swellengrebel 1907 (Approved Lists 1980)
           1 Genus Spirochaeta Ehrenberg 1835 (Approved Lists 1980)