prokaryotes - bacteria see Domain Bacteria Woese et al. 1990 stat. inval.
   Domain "Bacteria" Woese et al. 1990 stat. inval. see Domain Bacteria Woese et al. 2024
     Phylum "Bacteroidetes" Krieg et al. 2012 stat. inval. see Phylum Bacteroidota Krieg et al. 2021
       Class Bacteroidia Krieg 2012 [monotypic]
         Order Bacteroidales Krieg 2012
           Family Rikenellaceae Krieg et al. 2012
             1 Genus Acetobacteroides Su et al. 2014
             2 Genus Alistipes Rautio et al. 2003
             3 Genus Anaerocella Abe et al. 2013
             4 Genus Mucinivorans Nelson et al. 2015
             5 Genus Rikenella Collins et al. 1985