Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Domain Bacteria Woese et al. 2024
             Kingdom Bacillatiᵀ (Gibbons and Murray 1978) Oren and Göker 2024
               Phylum Bacillotaᵀ Gibbons and Murray 2021
                 Class Clostridia Rainey 2010
                   Order Halanaerobiales corrig. Rainey and Zhilina 1995
                     Family Halobacteroidaceae Zhilina and Rainey 1995
                       01 Genus Acetohalobium Zhilina and Zavarzin 1990 [monotypic]
                       02 Genus Fuchsiella Zhilina et al. 2012 [monotypic]
                       03 Genus Halanaerobacter corrig. Liaw and Mah 1996
                       04 Genus Halanaerobaculum Hedi et al. 2009 [monotypic]
                       05 Genus Halanaerocella Gales et al. 2025
                       06 Genus Halobacteroidesᵀ Oren et al. 1984
                       07 Genus Halonatronum Zhilina et al. 2001 [monotypic]
                       08 Genus Natroniella Zhilina et al. 1996
                       09 Genus Orenia Rainey and Stackebrandt 1995
                       10 Genus Sporohalobacter Oren et al. 1988 [monotypic]
                       11 Genus "Selenihalanaerobacter" Switzer Blum et al. 2001 nom. inval. [monotypic]
                       12 Genus "Candidatus Frackibacter" Booker et al. 2020