prokaryotes - bacteria see Domain Bacteria Woese et al. 1990 Domain "Bacteria" Woese et al. 1990 Phylum "Proteobacteria" Garrity et al. 2005 see Superphylum Proteobacteria Craig et al. 2010 Class Deltaproteobacteria Kuever et al. 2006 Order Desulfovibrionales Kuever et al. 2006 Family Desulfovibrionaceae Kuever et al. 2006 Genus Lawsonia McOrist et al. 1995