Kingdom Procaryotae Murray 1968 (Approved Lists 1980) see Domain Bacteria Woese et al. 1990
   Division Gracilicutes Gibbons and Murray 1978 (Approved Lists 1980) see Phylum Gracilicutes
     Class Scotobacteria Gibbons and Murray 1978 (Approved Lists 1980)
       Order Spirochaetales Buchanan 1917 (Approved Lists 1980)