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  Animalia
      Arthropoda
            Arachnida
                    Scorpiones
                            Iuridae
                                     Hadrurus
                                             Hadrurus arizonensis
                                             Hadrurus concolorous
                                             Hadrurus gertschi
                                             Hadrurus obscurus
                                             Hadrurus pinteri
                                             Hadrurus thayeri