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 Cymbellales D.G.Mann (1990)
         Family Cymbellaceae Grev. (1833)
           1 Genus Placoneis Mereschk. (1903)
           2 Genus Cymbella C.Agardh (1830)
           3 Genus Brebissonia Grunow (1860)
           4 Genus Encyonema Kütz. (1833)
           5 Genus Gomphocymbella O.Müll. (1905)