Class Proteobacteria Stackebrandt et al. 1988 nom. rej. see Phylum Proteobacteria Garrity and Holt 2001 nom. nud.
   Subclass gamma see Class Gammaproteobacteria "Garrity and Holt 2001" nom. nud.
     Family Alteromonadaceae Ivanova and Mikhailov 2001
       Genus Pseudoalteromonas Gauthier et al. 1995
         Pseudoalteromonas nigrifaciens (Baumann et al. 1984) Gauthier et al. 1995