prokaryotes - bacteria see Domain Bacteria Woese et al. 1990
   Domain "Bacteria" Woese et al. 1990
     Phylum "Spirochaetes" Garrity and Holt 2001 [monotypic]
       Class Spirochaetes Cavalier-Smith 2002
         Order Brevinematales Gupta et al. 2014 [monotypic]
           1 Family Brevinemataceae Paster 2012 [monotypic]