prokaryotes - bacteria see Domain Bacteria Woese et al. 1990
   Domain "Bacteria" Woese et al. 1990
     Phylum "Firmicutes" corrig. Gibbons and Murray 1978 (Approved Lists 1980)
       Class Clostridia Rainey 2010
         Order Clostridiales Prévot 1953 (Approved Lists 1980)
           Family Ruminococcaceae Rainey 2010
             01 Genus Acetanaerobacterium Chen and Dong 2004
             02 Genus Acetivibrio Patel et al. 1980
             03 Genus Anaerobacterium Horino et al. 2014
             04 Genus Anaerofilum Zellner et al. 1996
             05 Genus Anaerotruncus Lawson et al. 2004
             06 Genus Ercella van Gelder et al. 2014
             07 Genus Ethanoligenens Xing et al. 2006
             08 Genus Faecalibacterium Duncan et al. 2002
             09 Genus Fastidiosipila Falsen et al. 2005
             10 Genus Hydrogenoanaerobacterium Song and Dong 2009
             11 Genus Oscillibacter Iino et al. 2007
             12 Genus Oscillospira Chatton and Pérard 1913 (Approved Lists 1980)
             13 Genus Papillibacter Defnoun et al. 2000
             14 Genus Pseudobacteroides Horino et al. 2014
             15 Genus Ruminococcus Sijpesteijn 1948 (Approved Lists 1980)
             16 Genus Sporobacter Grech-Mora et al. 1996
             17 Genus Subdoligranulum Holmstrøm et al. 2004