prokaryotes - bacteria see Domain Bacteria Woese et al. 1990 Domain "Bacteria" Woese et al. 1990 Phylum "Verrucomicrobia" Hedlund 2011 Class Opitutae Choo et al. 2007 Order Opitutales Choo et al. 2007 [monotypic] Family Opitutaceae Choo et al. 2007 Genus Opitutus Chin et al. 2001