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 Naviculineae (Bessey) Hendey (1937)
           Family Plagiotropidaceae D.G.Mann (1990)
             1 Genus Plagiotropis Pfitzer (1871)
             2 ?Genus Stauropsis Meunier (1910) see Genus Meuniera P.C.Silva (1996)
             3 Genus Pachyneis Simonsen (1974)