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  Chromista
      Dinophyta
            Dinophyceae
                    Gonyaulacales
                            Pyrophacaceae
                                     Fragilidium
                                           [Helgolandinium]
                                             Fragilidium duplocampanaeforme
                                             Fragilidium fissile
                                             Fragilidium heterolobum
                                             Fragilidium lacustre
                                             Fragilidium mexicanum
                                             Fragilidium subglobosum
                                                   [Helgolandinium subglobosum]
                                     Pyrophacus
                                             Pyrophacus horologicum
                                             Pyrophacus horologium
                                             Pyrophacus steinii
                                                   [Pyrophacus horologicum var. steinii]
                                             Pyrophacus vancampoae