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 Colwellia Deming et al. 1988
         1 Colwellia hadaliensis Deming et al. 1988
         2 Colwellia psychrerythraea corrig. (ex D'Aoust and Kushner 1972) Deming et al. 1988
         3 Colwellia psychrotropica Bowman et al. 1998
         4 Colwellia demingiae Bowman et al. 1998
         5 Colwellia hornerae Bowman et al. 1998
         6 Colwellia rossensis Bowman et al. 1998
         7 Colwellia maris Yumoto et al. 1998