prokaryotes - bacteria see Domain Bacteria Woese et al. 1990
   "Archaea" Woese et al. 1990
     "Euryarchaeota" Garrity and Holt 2001
       Halobacteria Grant et al. 2002
         Halobacteriaceae Gibbons 1974 (Approved Lists 1980)
           Natronomonas Kamekura et al. 1997