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Organism
  Animalia
                  Hygrophila
                          Lymnaeoidea
                            Physidae
                                     Aplexa
                                             Aplexa fulginea
                                             Aplexa fuliginea
                                             Aplexa guliginosa
                                             Aplexa impluviata
                                             Aplexa spiculata
                                     Mexinauta
                                             Mexinauta aurantius
                                                   [Aplexa aurantia]
                                     Physa
                                             Physa fuliginosa
                              Physinae
                                     Physella
                                             Physella bermudezi
                                                   [Physa bermudezi]
                                             Physella cubensis
                                                   [Physa cubensis]
                                             Physella squalida
                                                   [Physa squalida]
                                             Physella virgata
                                     Stenophysa
                                             Stenophysa marmorata
                                                   [Aplexa marmorata]
                                                   [Physa marmorata]