[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 "Lachnospiraceae" nom. inval. see Family Lachnospiraceae Rainey 2010
             Genus Ruminococcus Sijpesteijn 1948 (Approved Lists 1980)
               01 Ruminococcus flavefaciens Sijpesteijn 1948 (Approved Lists 1980)
               02 Ruminococcus albus Hungate 1957 (Approved Lists 1980)
               03 Ruminococcus bromii Moore et al. 1972 (Approved Lists 1980)
               04 Ruminococcus callidus Holdeman and Moore 1974 (Approved Lists 1980)
               05 Ruminococcus gnavus Moore et al. 1976 (Approved Lists 1980)
               06 Ruminococcus hansenii (Holdeman and Moore 1974) Ezaki et al. 1994 see Blautia hansenii (Holdeman and Moore 1974) Liu et al. 2008
               07 Ruminococcus hydrogenotrophicus Bernalier et al. 1997 see Blautia hydrogenotrophica (Bernalier et al. 1997) Liu et al. 2008
               08 Ruminococcus lactaris Moore et al. 1976 (Approved Lists 1980)
               09 Ruminococcus luti Simmering et al. 2002 see Blautia luti (Simmering et al. 2002) Liu et al. 2008
               10 Ruminococcus obeum Moore et al. 1976 (Approved Lists 1980)
               11 Ruminococcus productus (Prévot 1941) Ezaki et al. 1994 see Blautia producta (Prévot 1941) Liu et al. 2008
               12 Ruminococcus schinkii Rieu-Lesme et al. 1997 see Blautia schinkii (Rieu-Lesme et al. 1997) Liu et al. 2008
               13 Ruminococcus torques Holdeman and Moore 1974 (Approved Lists 1980)