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 Thalassiophysales D.G.Mann (1990)
         1 Family Catenulaceae Mereschk. (1902)
         2 Family Thalassiophysaceae D.G.Mann (1990)