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 Ruminococcaceae Rainey 2010
                       Genus Ruminococcusᵀ Sijpesteijn 1948 (Approved Lists 1980)
                         01 Ruminococcus albus Hungate 1957 (Approved Lists 1980)
                         02 Ruminococcus bromii Moore et al. 1972 (Approved Lists 1980)
                         03 Ruminococcus callidus Holdeman and Moore 1974 (Approved Lists 1980)
                         04 Ruminococcus flavefaciensᵀ Sijpesteijn 1948 (Approved Lists 1980)
                         05 Ruminococcus gauvreauii Domingo et al. 2008
                         06 Ruminococcus gnavus Moore et al. 1976 (Approved Lists 1980)
                         07 Ruminococcus lactaris Moore et al. 1976 (Approved Lists 1980)
                         08 Ruminococcus obeum Moore et al. 1976 (Approved Lists 1980)
                         09 Ruminococcus scottomollicae Vandecandelaere et al. 2008
                         10 Ruminococcus torques Holdeman and Moore 1974 (Approved Lists 1980)