AlgaeBase Taxonomic Thesaurus
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  Chromista
      Dinophyta
            Dinophyceae
                    Gymnodiniales
                            Ptychodiscaceae
                                     Ptychodiscus
                                             Ptychodiscus brevis
                                             Ptychodiscus lineatus
                                             Ptychodiscus noctiluca
                                                   [Diplocystis antarctica]
                                                   [Ptychodiscus carinatus]
                                                   [Ptychodiscus inflatus]