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  Animalia
      Arthropoda
        Hexapoda
               [Apterygota]
            Insecta
              Pterygota
                Neoptera
                       [Endopterygota]
                       [Exopterygota]
                    Hemiptera
                      Heteroptera
                             [Geocorisae]
                        Nepomorpha
                               [Cryptocerata]
                               [Heteroptera-nepomorpha]
                               [Hydrocorisae]
                          Gelastocoroidea
                            Gelastocoridae
                              Gelastocorinae
                                     Gelastocoris
                                           [Galgulus]
                                             Gelastocoris oculatus
                                                   [Naucoris oculata]
                                               Gelastocoris oculatus oculatus
                                                     [Gelastocoris californiensis]
                                               Gelastocoris oculatus variegatus
                                                     [Gelastocoris variegatus]
                                             Gelastocoris rotundatus
                              Nerthrinae
                                     Nerthra
                                           [Glossoaspis]
                                           [Mononyx]
                                           [Peltopterus]
                                             Nerthra manni
                                             Nerthra martini
                                             Nerthra mexicana
                                             Nerthra rugosa
                                             Nerthra spangleri
                                             Nerthra stygica
                                             Nerthra toddi
                                             Nerthra usingeri