living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Prokaryotae see Superkingdom Prokarya
     Kingdom Monera Haeckel 1866 see Domain Bacteria Woese et al. 1990
       Division Bacteria (Haeckel 1894) see Domain Bacteria Woese et al. 1990
         "Gram-positive cocci"
           Family Peptococcaceae Rogosa 1971 (Approved Lists 1980)
             1 Genus Peptococcus Kluyver and van Niel 1936 (Approved Lists 1980)
             2 Genus Peptostreptococcus Kluyver and van Niel 1936 (Approved Lists 1980)
             3 Genus Ruminococcus Sijpesteijn 1948 (Approved Lists 1980)
             4 Genus Sarcina Goodsir 1842 (Approved Lists 1980)