[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   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 Flexibacter Soriano 1945 (Approved Lists 1980)
               01 Flexibacter flexilis Soriano 1945 (Approved Lists 1980)
               02 Flexibacter aggregans (Lewin 1969) Leadbetter 1974 (Approved Lists 1980)
               03 Flexibacter aurantiacus Lewin 1969 (Approved Lists 1980)
               04 Flexibacter canadensis Christensen 1980
               05 Flexibacter elegans (ex Lewin 1969) Reichenbach 1989
               06 Flexibacter litoralis Lewin 1969 (Approved Lists 1980)
               07 Flexibacter polymorphus Lewin 1974 (Approved Lists 1980)
               08 Flexibacter roseolus Lewin 1969 (Approved Lists 1980)
               09 Flexibacter ruber Lewin 1969 (Approved Lists 1980)
               10 Flexibacter tractuosus (Lewin 1969) Leadbetter 1974 (Approved Lists 1980) see Marivirga tractuosa (Lewin 1969) Nedashkovskaya et al. 2010