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 Halobacteroidaceae Zhilina and Rainey 1995
                       01 Genus Halobacteroidesᵀ Oren et al. 1984
                       02 Genus Acetohalobium Zhilina and Zavarzin 1990 [monotypic]
                       03 Genus Fuchsiella Zhilina et al. 2012 [monotypic]
                       04 Genus Halanaerobacter corrig. Liaw and Mah 1996
                       05 Genus Halanaerobaculum Hedi et al. 2009 [monotypic]
                       06 Genus Halonatronum Zhilina et al. 2001 [monotypic]
                       07 Genus Natroniella Zhilina et al. 1996
                       08 Genus Orenia Rainey and Stackebrandt 1995
                       09 Genus Selenihalanaerobacter Switzer Blum et al. 2001 [monotypic]
                       10 Genus Sporohalobacter Oren et al. 1988 [monotypic]