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  Animalia
      Arthropoda
        Hexapoda
               [Apterygota]
            Insecta
              Pterygota
                Neoptera
                       [Endopterygota]
                       [Exopterygota]
                    Hemiptera
                      Heteroptera
                             [Geocorisae]
                        Nepomorpha
                               [Cryptocerata]
                               [Heteroptera-nepomorpha]
                               [Hydrocorisae]
                          Nepoidea
                            Nepidae
                              Nepinae
                                     Curicta
                                             Curicta pronotata
                                             Curicta scorpio
                                                   [Curicta howardi]
                                     Nepa
                                             Nepa apiculata
                                             Nepa cinerea
                              Ranatrinae
                                     Ranatra
                                             Ranatra australis
                                             Ranatra brevicollis
                                             Ranatra buenoi
                                             Ranatra drakei
                                             Ranatra fusca
                                               Ranatra fusca edentula
                                               Ranatra fusca fusca
                                             Ranatra kirkaldyi
                                               Ranatra kirkaldyi hoffmanni
                                               Ranatra kirkaldyi kirkaldyi
                                             Ranatra linearis
                                                   [Nepa linearis]
                                             Ranatra montezuma
                                             Ranatra nigra
                                             Ranatra quadridentata
                                             Ranatra texana