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 Negativicutes Marchandin et al. 2010 [monotypic]
                   Order Acidaminococcales Campbell et al. 2015 [monotypic]
                     Family Acidaminococcaceaeᵀ Marchandin et al. 2010
                       Genus Phascolarctobacterium Del Dot et al. 1994
                         1 Phascolarctobacterium faeciumᵀ Del Dot et al. 1994
                         2 Phascolarctobacterium succinatutens Watanabe et al. 2012