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  Animalia
      Arthropoda
        Hexapoda
               [Apterygota]
            Insecta
              Pterygota
                Neoptera
                       [Endopterygota]
                       [Exopterygota]
                    Orthoptera
                      Caelifera
                        Acrididea
                               [Acridomorpha]
                               [Tetrigidea]
                          Eumastacoidea
                            Eumastacidae
                              Eumastacinae
                              Eumastacopinae
                              Gomphomastacinae
                              Masynteinae
                              Morseinae
                                     Eumorsea
                                             Eumorsea balli
                                             Eumorsea pinaleno
                                     Morsea
                                             Morsea californica
                                             Morsea catalinae
                                             Morsea dumicola
                                             Morsea islandica
                                             Morsea kaibabensis
                                             Morsea piute
                                             Morsea tamalpaisensis
                                     Psychomastax
                                             Psychomastax deserticola
                                               Psychomastax deserticola deserticola
                                               Psychomastax deserticola indigena
                                             Psychomastax inyo
                                             Psychomastax psylla
                                             Psychomastax robusta
                              Paramastacinae
                              Parepisactinae
                              Pseudomastacinae
                              Temnomastacinae