Kingdom Protoctista Hogg, 1860
   Phylum Bacillariophyta Engl. & Gilg (1919) - diatoms see [unranked] Diatomea Kütz. (1844)
     Class Bacillariophyceae Haeckel (1878) - pennates
       Subclass Bacillariophycidae D.G.Mann (1990) - raphid diatoms
         Order Naviculales Bessey (1907)
           Suborder Naviculineae (Bessey) Hendey (1937)
             1 Family Naviculaceae Kütz. (1844)
             2 Family Proschkiniaceae D.G.Mann (1990)
             3 Family Pleurosigmataceae Mereschk. (1903)
             4 Family Plagioitropidaceae see Family Plagiotropidaceae D.G.Mann (1990)
             5 Family Stauroneidaceae D.G.Mann (1990)