[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   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" "Garrity and Holt 2001" nom. nud. see Class Clostridia Rainey 2010
         Order Halanaerobiales corrig. Rainey and Zhilina 1995
           Family Halanaerobiaceae corrig. Oren et al. 1984
             Genus Halanaerobium corrig. Zeikus et al. 1984
               1 Halanaerobium praevalens corrig. Zeikus et al. 1984
               2 Halanaerobium acetethylicum corrig. (Rengpipat et al. 1989) Rainey et al. 1995
               3 Halanaerobium alcaliphilum corrig. Tsai et al. 1995
               4 Halanaerobium congolense corrig. Ravot et al. 1998
               5 Halanaerobium fermentans corrig. Kobayashi et al. 2000
               6 Halanaerobium kushneri corrig. Bhupathiraju et al. 1999
               7 Halanaerobium lacusrosei corrig. Cayol et al. 1995
               8 [Halanaerobium saccharolyticum] corrig. (Zhilina et al. 1992) Rainey et al. 1995
               9 Halanaerobium salsuginis corrig. Bhupathiraju et al. 1994