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. 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 Sporomusaceae Campbell et al. 2015
                       Genus Pelosinus Shelobolina et al. 2007
                         Pelosinus fermentansᵀ Shelobolina et al. 2007
                         Pelosinus propionicus (Boga et al. 2007) Moe et al. 2012
                         Pelosinus defluvii Moe et al. 2012