Domain Bacteria Woese et al. 1990
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   Phylum Proteobacteria Garrity and Holt 2001 see Phylum Proteobacteria Garrity et al. 2005
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     Class "Gammaproteobacteria" nom. inval. see Class Gammaproteobacteria Garrity et al. 2005
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       Order "Enterobacteriales" Garrity and Holt 2001 nom. nud.
      Count: [*] *
         Family Enterobacteriaceae Rahn 1937 (Approved Lists 1980)
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           Genus Photorhabdus Boemare et al. 1993
          Count: -