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Organism
  Animalia
         [Metazoa]
      Mollusca
            Bivalvia
                   [Conchifera]
                   [Lamellibranchiata]
                   [Pelecypoda]
              Autobranchia
               Heteroconchia
                Euheterodonta
                  Imparidentia
                          Cyamioidea
                            Sportellidae
                                     Angusticardo
                                     Ensitellopsis
                                     Fabella
                                             Fabella constricta
                                             Fabella pilsbryi
                                             Fabella stearnsii
                                     Monterosatus
                                     Sportella
                                             Sportella dubia
                                             Sportella jubata
                                             Sportella recondita
                                             Sportella sperabilis