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  Animalia
      Arthropoda
        Chelicerata
            Merostomata
                    Xiphosura
                      Limulina
                            Limulidae
                                     Carcinoscorpius
                                             Carcinoscorpius rotundicauda
                                     Limulus
                                             Limulus polyphemus
                                     Tachypleus
                                             Tachypleus tridentatus