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 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