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 Neidiineae D.G.Mann (1990)
           Family Diadesmidaceae D.G.Mann (1990)
             [Genus Diademis D.G.Mann (1990)] see Genus Diadesmis Kütz. (1844)
               [Diademis confervacea Round, R.M. Crawford & D.G.Mann (1990)] see Diadesmis confervacea Kütz. (1844)