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 Achnanthales P.C.Silva (1962)
        Count: [f] 3f;8g
           Family Achnanthidiaceae D.G.Mann (1990)
          Count: 2g
             1 Genus Achnanthidium Kütz. (1844)
            Count: -
             2 Genus Eucocconeis Cleve (1895)
            Count: -