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Organism
  Chromista
         [Microbe]
      Chrysophyta
            Bacillariophyceae
                    Pennales
                            Fragilariaceae
                                     Asterionella
                                             Asterionella formosa
                                               Asterionella formosa var. gracillima
                                             Asterionella ralfsii
                                               Asterionella ralfsii var. americana
                                     Ctenophora
                                             Ctenophora pulchella
                                               Ctenophora pulchella var. lacerata
                                     Diatoma
                                     Fragilaria
                                     Hannaea
                                     Meridion
                                     Opephora
                                     Pseudostaurosira
                                     Stauroforma
                                     Staurosira
                                     Staurosirella
                                     Synedra
                                     Tabularia
                                     Ulnaria