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)
           Genus Encyonema Kütz. (1833)
             Encyonema turgidum (Gregory) Grunow ex A.Schmidt (1875)