Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         [crown] Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Domain Bacteria Woese et al. 1990 [paraphyletic?]
             Superphylum Terrabacteria Battistuzzi et al. 2004
               Phylum Firmicutes corrig. Gibbons and Murray 1978 (Approved Lists 1980)
                 Class Clostridia Rainey 2010
                   Order Halanaerobiales corrig. Rainey and Zhilina 1995
                     Family Halanaerobiaceaeᵀ corrig. Oren et al. 1984
                       Genus Halanaerobiumᵀ corrig. Zeikus et al. 1984
                         01 Halanaerobium acetethylicum corrig. (Rengpipat et al. 1989) Rainey et al. 1995
                         02 Halanaerobium alcaliphilum corrig. Tsai et al. 1995
                         03 Halanaerobium congolense corrig. Ravot et al. 1998
                         04 Halanaerobium fermentans corrig. Kobayashi et al. 2000
                         05 Halanaerobium kushneri corrig. Bhupathiraju et al. 1999
                         06 Halanaerobium lacusrosei corrig. Cayol et al. 1995
                         07 Halanaerobium praevalensᵀ corrig. Zeikus et al. 1984
                         08 Halanaerobium saccharolyticum corrig. (Zhilina et al. 1992) Rainey et al. 1995
                         10 Halanaerobium sehlinense Abdeljabbar et al. 2013
                         9 Halanaerobium salsuginis corrig. Bhupathiraju et al. 1994