Domain Bacteria Woese et al. 1990
   Phylum Bacteroidetes Garrity and Holt 2001 see Phylum Bacteroidetes Krieg et al. 2012
     Class "Sphingobacteria" see Class Sphingobacteriia Kämpfer 2012
       Order "Sphingobacteriales" Kämpfer, 2012 see Order Sphingobacteriales Kämpfer 2012
         Family "Flexibacteraceae" see Family Cytophagaceae Stanier 1940 (Approved Lists 1980)
           Genus Cyclobacterium Raj and Maloy 1990
           Genus Cytophaga Winogradsky 1929 (Approved Lists 1980)
           Genus Flectobacillus Larkin et al. 1977 (Approved Lists 1980)
           Genus Hymenobacter Hirsch et al. 1999
           Genus Meniscus Irgens 1977 (Approved Lists 1980)
           Genus Microscilla Pringsheim 1951 (Approved Lists 1980)
           Genus Runella Larkin and Williams 1978 (Approved Lists 1980)
           Genus Spirosoma Migula 1894 (Approved Lists 1980)
           Genus Sporocytophaga Stanier 1940 (Approved Lists 1980)
           1 Genus Flexibacter Soriano 1945 (Approved Lists 1980)