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Organism
  Animalia
         [Metazoa]
      Echinodermata
             [Eleutherozoa]
             [Pelmatoza]
             [Pelmatozoa]
        Echinozoa
            Echinoidea
              Euechinoidea
                  Diadematacea
                    Echinothurioida
                           [Echinothuroida]
                            Echinothuriidae
                                   [Echinothuridae]
                                     Araeosoma
                                             Araeosoma belli
                                             Araeosoma coriaceum
                                             Araeosoma eurypatum
                                             Araeosoma fenestratum
                                                   [Calveria fenestrata]
                                             Araeosoma leptaleum
                                             Araeosoma owstoni
                                               Araeosoma owstoni bicolor
                                                     [Asthenosoma bicolor]
                                               Araeosoma owstoni nudum
                                             Araeosoma parviungulatum
                                             Araeosoma paucispinum
                                             Araeosoma tessellatum
                                             Araeosoma thetidis
                                             Araeosoma violaceum
                                     Calveria
                              Echinothuriinae
                                     Asthenosoma
                                           [Cyanosoma]
                                             Asthenosoma dilatatum
                                             Asthenosoma ijimai
                                             Asthenosoma intermedium
                                             Asthenosoma marisrubri
                                             Asthenosoma varium
                                     Calveriosoma
                                             Calveriosoma gracile
                                                   [Asthenosoma pyrochloa]
                                             Calveriosoma hystrix
                                                   [Asthenosoma hystrix]
                                     Echinothuria
                                     Hapalosoma
                                             Hapalosoma pellucidum
                                     Hygrosoma
                                             Hygrosoma hoplacantha
                                                   [Hygrosoma hoplacanthum]
                                             Hygrosoma luculentum
                                             Hygrosoma petersi
                                             Hygrosoma petersii
                              Hygrosomatinae
                                     Phormosoma
                                             Phormosoma placenta
                                               Phormosoma placenta placenta
                                               Phormosoma placenta sigsbei
                                     Sperosoma
                                             Sperosoma antillense
                                             Sperosoma biseriatum
                                             Sperosoma giganteum
                                             Sperosoma grimaldii
                              Sperosomatinae
                                     Tromikosoma
                                             Tromikosoma hispidum
                                             Tromikosoma panamense
                                             Tromikosoma uranus