Kingdom Protoctista Hogg, 1860
Count: [p] 36p;91c;87o;183f;507g;35s;2v
   Phylum Bacillariophyta Engl. & Gilg (1919) - diatoms see [unranked] Diatomea Kütz. (1844)
  Count: [f] 4c;41o;83f;204g
     Class Bacillariophyceae Haeckel (1878) - pennates
    Count: 11o;37f;84g
       Subclass Bacillariophycidae D.G.Mann (1990) - raphid diatoms
      Count: [f] 10o;35f;79g
         Order Naviculales Bessey (1907)
        Count: [f] 17f;32g
           Suborder Naviculineae (Bessey) Hendey (1937)
          Count: [f] 5f;14g
             Family Plagioitropidaceae see Family Plagiotropidaceae D.G.Mann (1990)
            Count: 1g
               Genus Plagiotropis Pfitzer (1871)
              Count: -