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 "Firmicutes" (Gibbons and Murray 1978) Garrity and Holt 2001 stat. inval. see Phylum Bacillota Gibbons and Murray 2021
       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 nom. illeg.
             4 Genus Haloincola Zhilina et al. 1992 see Genus Halanaerobium corrig. Zeikus et al. 1984
             5 Genus Halothermothrix Cayol et al. 1994