prokaryotes - bacteria see Domain Bacteria Woese et al. 1990
   Domain "Bacteria" Woese et al. 1990
     Phylum "Proteobacteria" Garrity et al. 2005 see Superphylum Proteobacteria Craig et al. 2010
       Class Gammaproteobacteria Garrity et al. 2005
         Order Oceanospirillales Garrity et al. 2005
           Family Hahellaceae Garrity et al. 2005
             1 Genus Endozoicomonas Kurahashi and Yokota 2007
             2 Genus Hahella Lee et al. 2001
             3 Genus Halospina Sorokin et al. 2006
             4 Genus Kistimonas Choi et al. 2010
             5 Genus Zooshikella Yi et al. 2003