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 Crenotrichaceae Hansgirg 1888 (Approved Lists 1980)
           Genus Chitinophaga Sangkhobol and Skerman 1981
           Genus Rhodothermus Alfredsson et al. 1995
           Genus Toxothrix Molisch 1925 (Approved Lists 1980)
           1 Genus Crenothrix Cohn 1870 (Approved Lists 1980)