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 Spirochaetales Buchanan 1917 (Approved Lists 1980) Family Borreliaceae Gupta et al. 2014 Genus Borrelia Swellengrebel 1907 (Approved Lists 1980)