prokaryotes - bacteria see Domain Bacteria Woese et al. 1990 stat. inval.
   Domain "Bacteria" Woese et al. 1990 stat. inval. see Domain Bacteria Woese et al. 2024
     Phylum "Proteobacteria" Garrity et al. 2005 stat. inval. see Phylum Pseudomonadota Garrity et al. 2021
       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