Procaryotic Genera
   Domain "Bacteria" Woese et al. 1990 stat. inval. see Domain Bacteria Woese et al. 2024
     Phylum Bacteroidetes Garrity and Holt 2001 nom. inval. see Phylum Bacteroidetes Krieg et al. 2012 stat. inval.
       Class "Sphingobacteria" "Garrity and Holt 2001" nom. nud. [monotypic] see Class Sphingobacteriia Kämpfer 2012
         Order "Sphingobacteriales" "Garrity and Holt 2001" nom. nud. see Order Sphingobacteriales Kämpfer 2012
           Family "Flexibacteraceae" "Garrity and Holt 2001" nom. nud. see Family Flexibacteraceae García-López et al. 2020
             Genus Spirosoma Migula 1894 (Approved Lists 1980)