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 Selenomonadales Marchandin et al. 2010
                     Family Selenomonadaceaeᵀ Campbell et al. 2015
                       1 Genus Anaerovibrio Hungate 1966 (Approved Lists 1980) [monotypic]
                       2 Genus Centipeda Lai et al. 1983 [monotypic]
                       3 Genus Megamonas Shah and Collins 1983
                       4 Genus Mitsuokella Shah and Collins 1983
                       5 Genus Pectinatus Lee et al. 1978 (Approved Lists 1980)
                       6 Genus Propionispira Schink et al. 1983 [monotypic]
                       7 Genus Schwartzia van Gylswyk et al. 1997 [monotypic]
                       8 Genus Selenomonasᵀ von Prowazek 1913 (Approved Lists 1980)
                       9 Genus Zymophilus Schleifer et al. 1990