Class Proteobacteria Stackebrandt et al. 1988 see Phylum Proteobacteria Garrity and Holt 2001
   Subclass gamma see Class Gammaproteobacteria nom. inval.
     Family Alteromonadaceae Ivanova and Mikhailov 2001
       Genus Alteromonasᵀ Baumann et al. 1972 (Approved Lists 1980)
         Alteromonas nigrifaciens (ex White 1940) Baumann et al. 1984 see Pseudoalteromonas nigrifaciens (Baumann et al. 1984) Gauthier et al. 1995