Kingdom Bacteria Cavalier-Smith 2002 - bacteria see Domain Bacteria Woese et al. 1990 Status: extant 1 Subkingdom Negibacteria Cavalier-Smith 2002 - negibacteria see Domain Bacteria Woese et al. 1990 Status: extant 2 Subkingdom Unibacteria Cavalier-Smith 2002 see Domain Bacteria Woese et al. 1990 Status: extant