Division Bacillariophyta Engl. & Gilg (1919) see Phylum Bacillariophyta Engl. & Gilg (1919)
   Class Bacillariophyceae Haeckel (1878) - pennates
     Subclass Bacillariophycidae D.G.Mann (1990) - raphid diatoms
       Order Naviculales Bessey (1907)
         Suborder Sellaphorineae D.G.Mann (1990)
           Family Sellaphoraceae Mereschk. (1902)
             Genus Fallacia Stickle & D.G.Mann (1990)
               Fallacia hudsonis (Grunow ex Cleve) Stickle & D.G.Mann (1990)