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 Clostridia Rainey 2010
                   Order Clostridialesᵀ Prévot 1953 (Approved Lists 1980)
                     Family Peptoniphilaceae Johnson et al. 2014
                       Genus Peptoniphilusᵀ Ezaki et al. 2001
                         01 Peptoniphilus asaccharolyticus (Distaso 1912) Ezaki et al. 2001
                         02 Peptoniphilus harei (Murdoch et al. 1997) Ezaki et al. 2001
                         03 Peptoniphilus indolicus (Christiansen 1934) Ezaki et al. 2001
                         04 Peptoniphilus ivorii (Murdoch et al. 1997) Ezaki et al. 2001
                         05 Peptoniphilus lacrimalis (Li et al. 1992) Ezaki et al. 2001
                         06 Peptoniphilus gorbachii Song et al. 2010
                         07 Peptoniphilus olsenii Song et al. 2010
                         08 Peptoniphilus methioninivorax Rooney et al. 2011
                         09 Peptoniphilus duerdenii Ulger-Toprak et al. 2012
                         10 Peptoniphilus koenoeneniae Ulger-Toprak et al. 2012
                         11 Peptoniphilus coxii Citron et al. 2013
                         12 Peptoniphilus tyrrelliae Citron et al. 2013
                         13 Peptoniphilus stercorisuis Johnson et al. 2014