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  Animalia
      Acanthocephala
            Palaeacanthocephala
                    Echinorhynchida
                            Hypoechinorhynchidae
                                     Bolborhynchoides
                                           [Fresnyarhynchus]
                                             Bolborhynchoides exiguus
                                                   [Bolborhynchus exiguus]
                                                   [Fresnyarhynchus exiguus]
                                     Hypoechinorhynchus
                                             Hypoechinorhynchus alaeopis
                                             Hypoechinorhynchus magellanicus