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. 2024
             Kingdom Bacillatiᵀ (Gibbons and Murray 1978) Oren and Göker 2024
               Phylum Bacillotaᵀ Gibbons and Murray 2021
                 Class Clostridia Rainey 2010
                   Order Eubacteriales Buchanan 1917 (Approved Lists 1980)
                     Family Oscillospiraceae Peshkoff 1940 (Approved Lists 1980)
                       Genus Ruminococcus 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)