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 Negativicutes Marchandin et al. 2010
         Order Selenomonadales Marchandin et al. 2010
           Family Selenomonadaceae Campbell et al. 2015
             1 Genus Anaerovibrio Hungate 1966 (Approved Lists 1980)
             2 Genus Centipeda Lai et al. 1983
             3 Genus Megamonas Shah and Collins 1983
             4 Genus Mitsuokella Shah and Collins 1983
             5 Genus Pectinatus Lee et al. 1978 (Approved Lists 1980)
             6 Genus Propionispira Schink et al. 1983
             7 Genus Schwartzia van Gylswyk et al. 1997
             8 Genus Selenomonas von Prowazek 1913 (Approved Lists 1980)
             9 Genus Zymophilus Schleifer et al. 1990