[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Bacteria Woese et al. 1990
     Phylum Firmicutes corrig. Gibbons and Murray 1978 (Approved Lists 1980)
       Class "Clostridia" Garrity et al. 2001 nom. ined. see Class Clostridia Rainey 2010
         Order Clostridiales Prévot 1953 (Approved Lists 1980)
           Family "Acidaminococcaceae" Marchandin et al., 2010 see Family Acidaminococcaceae Marchandin et al. 2010
             Genus Selenomonas von Prowazek 1913 (Approved Lists 1980)
               [Selenomonas ruminantium] (Certes 1889) Wenyon 1926 (Approved Lists 1980)
                 Selenomonas ruminantium subsp. ruminantiumᵀ (Certes 1889) Bryant 1956 (Approved Lists 1980)