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  Animalia
      Arthropoda
        Chelicerata
            Arachnida
                    Scorpiones
                            Iuridae
                                     Anuroctonus
                                             Anuroctonus phaiodactylus
                                             Anuroctonus pococki
                                     Hadrurus
                                             Hadrurus arizonensis
                                               Hadrurus arizonensis arizonensis
                                             Hadrurus obscurus
                                             Hadrurus spadix