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  Animalia
    Bilateria
     Deuterostomia
      Echinodermata
             [Eleutherozoa]
             [Pelmatoza]
             [Pelmatozoa]
        Echinozoa
            Echinoidea
              Perischoechinoidea
                    Cidaroida
                            Cidaridae
                                     Aporocidaria
                                             Aporocidaria fragilis
                                     Cidaris
                                             Cidaris abyssicola
                                             Cidaris antillarum
                                             Cidaris blakei
                                             Cidaris cidaris
                                             Cidaris rugosa
                                     Cidarites
                                     Eucidaris
                                             Eucidaris thouarsii
                                             Eucidaris tribuloides
                                                   [Cidarites tribuloides]
                                               Eucidaris tribuloides africana
                                               Eucidaris tribuloides tribuloides
                                     Genocidaris
                                             Genocidaris affinis
                                             Genocidaris maculata
                                     Stereocidaris
                                             Stereocidaris ingolfiana
                                     Stylocidaris
                                             Stylocidaris affinis
                                             Stylocidaris lineata
                                     Tretocidaris