[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Bacteria Woese et al. 1990
     Phylum Firmicutes corrig. Gibbons and Murray 1978 (Approved Lists 1980)
       Class "Clostridia" Garrity et al. 2001 nom. ined. see Class Clostridia Rainey 2010
         Order Halanaerobiales corrig. Rainey and Zhilina 1995
           1 Family Halanaerobiaceae corrig. Oren et al. 1984
           2 Family Halobacteroidaceae Zhilina and Rainey 1995