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  Animalia
    Bilateria
     Deuterostomia
      Echinodermata
             [Eleutherozoa]
             [Pelmatoza]
             [Pelmatozoa]
        Echinozoa
            Echinoidea
              Euechinoidea
                  Diadematacea
                    Echinothurioida
                            Echinothuriidae
                                     Araeosoma
                                             Araeosoma belli
                                             Araeosoma fenestratum
                                             Araeosoma violaceum
                                     Hygrosoma
                                             Hygrosoma petersi
                                     Phormosoma
                                             Phormosoma placenta
                                               Phormosoma placenta placenta
                                               Phormosoma placenta sigsbei
                                     Sperosoma
                                             Sperosoma antillense
                                             Sperosoma biseriatum
                                             Sperosoma giganteum