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Organism

  Animalia

      Echinodermata

            Echinoidea

              Perischoechinoidea

                    Cidaroida

                            Cidaridae

                                     Centrocidaris

                                             Centrocidaris doederleini

                              Cidarinae

                                     Eucidaris

                                             Eucidaris galapagensis

                                             Eucidaris thouarsii

                                                   [Eucidaris thouarsi]

                                             Eucidaris tribuloides

                                     Hesperocidaris

                                             Hesperocidaris asteriscus

                                             Hesperocidaris dubia

                                                   [Tretocidaris dubia]

                                             Hesperocidaris panamensis

                                             Hesperocidaris perplexa

                                     Stylocidaris

                                             Stylocidaris affinis

                                     Tretocidaris

                                             Tretocidaris bartletti