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  Animalia
      Arthropoda
            Insecta
                    Plecoptera
                            Perlodidae
                                     Isogenus
                                             Isogenus venustus
                                     Isoperla
                                             Isoperla acula
                                             Isoperla adunca
                                             Isoperla denningi
                                             Isoperla karuk
                                             Isoperla laucki
                                             Isoperla rainiera
                                     Oroperla
                                             Oroperla barbara