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 Tissierellales Alauzet et al. 2020
                     Family Tissierellaceaeᵀ Wu et al. 2020
                       1 Genus Gudongella Wu et al. 2020
                       2 Genus Keratinibaculum Huang et al. 2015
                       3 Genus Schnuerera Lawson 2020
                       4 Genus Soehngenia Parshina et al. 2003 [monotypic]
                       5 Genus Tepidimicrobium Slobodkin et al. 2006 [monotypic]
                       6 Genus Tissierellaᵀ Collins and Shah 1986
                       7 Genus "Paratissierella" Liu et al. 2021 nom. inval.
                       8 Genus "Urmitella" Pham et al. 2017 nom. inval.