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Eukaryota
  Chromista
    Heterokontophyta
      Ochrophyta
            Bacillariophyceae
                    Fragilariales
                            Fragilariaceae
                                     Fragilaria
                                             Fragilaria crotonensis
                                             Fragilaria diatomoides
                                             Fragilaria prolongata
                                                   [Fragilaria crotonensis var. prolongata]