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 stat. inval.
       Division Bacteria Murray 1974 nom. vernac. see Domain Bacteria Woese et al. 1990 stat. inval.
         "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)