prokaryotes - bacteria see Domain Bacteria Woese et al. 1990
   Domain "Bacteria" Woese et al. 1990
     Phylum "Firmicutes" corrig. Gibbons and Murray 1978 (Approved Lists 1980)
       Class Clostridia Rainey 2010
         Order Halanaerobiales corrig. Rainey and Zhilina 1995
           Family Halanaerobiaceae corrig. Oren et al. 1984
             1 Genus Halanaerobium corrig. Zeikus et al. 1984
             2 Genus Halarsenatibacter Switzer Blum et al. 2010
             3 Genus Halocella Simankova et al. 1994
             4 Genus Haloincola Zhilina et al. 1992 see Genus Halanaerobium corrig. Zeikus et al. 1984
             5 Genus Halothermothrix Cayol et al. 1994