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Organism
  Animalia
         [Metazoa]
      Echinodermata
             [Eleutherozoa]
             [Pelmatoza]
             [Pelmatozoa]
        Echinozoa
            Echinoidea
              Euechinoidea
                  Diadematacea
                    Diadematoida
                            Aspidodiadematidae
                                     Aspidodiadema
                                             Aspidodiadema arcitum
                                             Aspidodiadema hawaiiense
                                             Aspidodiadema jacobyi
                                             Aspidodiadema meijerei
                                             Aspidodiadema tonsum
                                     Plesiodiadema
                                           [Dermatodiadema]
                                             Plesiodiadema antillarum
                                                   [Aspidodiadema antillarum]
                                             Plesiodiadema globulosum
                                                   [Dermatodiadema globulosum]
                                             Plesiodiadema horridum
                                             Plesiodiadema indicum