• Acetivibrio cellulolyticus Patel et al., 1980
• Acetivibrio cellulosolvens Khan et al., 1984
• Acetivibrio ethanolgignens Robinson & Ritchie, 1981
• Acetivibrio multivorans Tanaka et al., 1992
• Anaerofilum agile Zellner et al., 1996
• Anaerofilum pentosovorans Zellner et al., 1996
• Anaerotruncus colihominis Lawson et al., 2004
• Faecalibacterium prausnitzii (Hauduroy et al., 1937) Duncan et al., 2002
• Papillibacter cinnamivorans Defnoun et al., 2000
• Ruminococcus albus Hungate, 1957
• Ruminococcus bromii Moore et al., 1972
• Ruminococcus callidus Holdeman & Moore, 1974
• Ruminococcus flavefaciens Sijpesteijn, 1948
• Ruminococcus gnavus Moore et al., 1976
• Ruminococcus hansenii (Holdeman & Moore 1974) Ezaki et al., 1994
• Ruminococcus hydrogenotrophicus Bernalier et al., 1997
• Ruminococcus lactaris Moore et al., 1976
• Ruminococcus luti Simmering et al., 2002
• Ruminococcus obeum Moore et al., 1976
• Ruminococcus palustris Zhilina et al., 1997
• Ruminococcus palustris Zhilina et al., 1997 accepted as Trichococcus palustris (Zhilina et al., 1997) Liu et al., 2002
• Ruminococcus pasteurii Schink, 1985
• Ruminococcus pasteurii Schink, 1985 accepted as Lactosphaera pasteurii (Schink 1985) Janssen et al., 1995
• Ruminococcus pasteurii Schink, 1985 accepted as Trichococcus pasteurii (Schink, 1985) Liu et al., 2002
• Ruminococcus productus (Prévot, 1941) Ezaki et al., 1994
• Ruminococcus schinkii Rieu-Lesme et al., 1997
• Ruminococcus torques Holdeman & Moore, 1974
• Sporobacter termitidis Grech-Mora et al., 1996